Very interesting points Raoul, and your description of Julie Andrews is spot on. Doris Day is a similar type.
Although I think "Disney" should be distinguished from the "Walt Disney" company. Wasn't he a Catholic? I think his company went downhill after his death.
I had a similar memory of Mary Poppins to Elizabeth and Dulcamara. I saw it when I was a kid and she always gave me the creeps. I can sooner believe she was meant to signify the devil than any angel.
I read a book called Trance Formation of America, and though I question how seriously the book should be taken, the mind controlled slaves would watch Wizard of Oz to reinforce their programming. Supposedly that film is full of the occult.