Yes, I have at times...

And I know what you mean about certain people giving you a feeling of an evil presence...

I try to pray whenever I am in a situation like that, and I am grateful at such times that I almost always wear a Saint Benedict medal.   :)

Yes, in certain places and near certain persons. No place as strongly as inside an NO parish, where everything seems topsy turvy to me. From the lighthearted banter of a homily, to the confusion at the distribution of the Holy Eucharist where several people descend upon the altar to collect chalices and patens and the ensuing shuffle in the aisles as a few faithful position themselves to receive from the priest. 

In contrast, I feel the overwhelming calm when passing in front of a Tabernacle, or falling to my knees at adoration. 

Have you ever felt the tangible presence of Satan?

Yup.  
It amazes me when people CAN'T perceive it.

Feelings aren't everything!

We are wonderfully created with five senses; touch, smell, hear, taste and see. Therefore we can feel when something is amiss. But you are right, feeling isn't everything. The devil, the angel of light, the father of lies, the subtle serpent, is cunning. We must be careful of accepting something or someone at face value. We are to discern:
1 John 4(NRSVCE)
Testing the Spirits
4 Beloved, do not believe every spirit, but test the spirits to see whether they are from God; for many false prophets have gone out into the world. 2 By this you know the Spirit of God: every spirit that confesses that Jesus Christ has come in the flesh is from God, 3 and every spirit that does not confess Jesus is not from God. And this is the spirit of the antichrist, of which you have heard that it is coming; and now it is already in the world. 4 Little children, you are from God, and have conquered them; for the one who is in you is greater than the one who is in the world. 5 They are from the world; therefore what they say is from the world, and the world listens to them. 6 We are from God. Whoever knows God listens to us, and whoever is not from God does not listen to us. From this we know the spirit of truth and the spirit of error.

Feelings aren't everything!

In my previous post, I want to clarify that I'm not referring to "feelings" of the emotional or sentimental type. The "sense" of Satan is primarily in the intellect.  Sometimes negative emotions follow.  Often, I don't "feel" anything.  I just suddenly "know" something is spiritually very wrong, so I take action, by prayers, by avoidance, by removing myself if possible.  I've been this way for as far back as I can remember; say, 2 1/2 - 3 years.  
I rarely talk about it, even among fellow trads, because it has led to other thinking and then gossiping that I'm mentally ill, or myself under demonic influence,  which I certainly am not!
Often, the place, person, object to which evil has attached itself is NOT discernible via the physical senses, or else it is, but is concealed at first. A few examples where later on, the presence of evil was confirmed.  I was waiting at night on the sidewalk for a city bus.  Everything I stood adjacent to a dry cleaning business, closed until morning, I "sensed" evil.  If I moved away from the dry cleaner, about two storefronts down, everything seemed fine.  I didn't give it much thought or try to analyze, I simply stood back from actual bus stop and jogged up to the bus when it arrived.  It wasn't until I was in the bus and pulling away that I saw the upper floors of the building housing the dry cleaner.  On about the 6th or 7th floor was the office of a psychic, the window lit up by a large flashing neon sign.  
I've met people, yes, even traditional Catholics, whose outward appearance and demeanor looked fine, only to later discover what was wrong.  A couple in their 60s, members of the Rosary Society, who allowed their 30 year old son to live in their basement with his male "partner."  A young teacher who spoke sweetly, but was later dismissed when it came to light she was listening at night to death metal music, an avid fan.  Conversely, there are times when a person whose physical appearance and demeanor is distasteful, but give me no dense of evil.  This happens normally with non-Catholics.  Most of the time, however, I never learn what's wrong.  
  

On a related topic;

Italian priest Sante Babolin said that Satan is behind several recent attacks in various parts of the world against the Virgin Mary, noting that she is a powerful advocate for him during exorcisms.
“In my experience – so far I have performed 2,300 rites of exorcism – I can say that the invocation of the Most Holy Virgin Mary often provokes significant reactions in the person being exorcized,” he told Mexican weekly Desde la Fe.
Fr. Babolin, who also taught at the Gregorian University in Rome, said that “in face of the failure of the onslaught by non-believers, now, in order to offend and confound the Catholic people, the Virgin Mary, whom the devil hates, is being attacked.”
Desde la Fe noted the recent events of the Spanish drag queen Borja Casillas, who masqueraded as the Virgin Mary and mocked her in a performance, as well as a woman who dressed up as the Virgin Mary and simulated an abortion during a protest in Argentina.
The Italian exorcist said that “as proof of this hatred” of the devil toward the Mother of God, “while I was insistently invoking the Most Holy Virgin Mary, the devil answered me: 'I can't stand That One (Mary) any more and neither can I stand you any more.'”
Fr. Babolin also noted that “the Second Vatican Council declares that Mary, daughter of Adam, in accepting the divine message, became the Mother of Jesus, and embracing with her whole heart and without the hindrance of any sin the saving will of God, consecrated herself totally, as the servant of the Lord, to the person and work of her Son.”
The priest pointed out the passage in the book of Genesis – which is evoked in the Rite of Exorcism – where God says to the serpent that “she will crush your head.”  
In this ritual, he said, the exorcist says to the devil: “Most cunning serpent, you shall no more dare to deceive the human race, persecute the Church, torment God's elect and sift them as wheat (...) The sacred Sign of the Cross commands you, as does also the power of the mysteries of the Christian Faith (...) The glorious Mother of God, the Virgin Mary, commands you; she who by her humility and from the first moment of her Immaculate Conception crushed your proud head.”
Fr. Babolin also said that “the strongest reactions” of the devil during the exorcism occur “when references are made to her apparitions.”
Because of this, he frequently pronounces the name of Holy Mary with her titles of Lourdes, Fatima or Guadalupe. In the latter case, he said, “I use this formula: 'Holy Mary, Our Lady of Guadalupe, Queen of Tepeyac.'”
The exorcist warned that “the instrument the (the devil) normally uses to trap us is money, since it offers the possibility of satisfying the impulses that converge in pleasure and power.”
Satan “subjugates us to himself manipulating the truth and offering us his dazzling light, showing us his version of 'freedom' and promising us the instant gratification of our whims.”
“As far as interpersonal communication, the sense of sight overtakes the sense of hearing; and consequently the image over the word; that is to say, desire precedes reflection,” he said.
Fr. Babolin encouraged Catholics to denounce attacks on the faith as well as to organize and participate in prayer events, pray the Rosary, and participate in Masses at places where offenses were committed.
http://www.catholicnewsagency.com/news/why-the-devil-hates-mary-especially-during-exorcisms-93682/

 think I began the prayer three times and not until I had sprinkled some holy water on him could I finish it.”

I think the devil is largely responsible for a lot of "weird" things that happen to us. It is up to us to resist through prayers, holy water, etc.
and it seems that evil often triumphs over good. I realize that evil will not triumph in the End but it amazes me that it triumphs so often