I can't speak for anyone else. Yeah about all the miming Et cuм spiritu tuo. But that's the beauty of keeping my eyes either on the missal or on the altar and not on what anyone else is doing.
In advance I read the Propers because it seems that it helps the faith to be at least aware of what's what during the liturgical year. Also, I understand the Latin (being one of those "south of Calais" people), and I don't see the evil in simultaneously hearing and reading along the fully non-dialogue parts from Introit to Last Gospel. There's a fullness to it this way, and for me it's devotional.
If you understand latin to a large extent, then you must enjoy the richness of the prayers, proper and ordinary, of the Mass and you should be thankful, for the liturgy is absolutely wondrous.
However, you've been saying something in a couple of posts that is just not true. People, be they from certain meridional parts of latin countries or not, do not understand latin simply in virtue of their mother tongue. This has not been the case for quite some time.