Yes!!!!!
You can't bother pointing it out to them because they will say something stupid like, "well, if I'm being brainwashed everybody should be" or something as ridiculous. They see it as a good thing.
After a convention? it can take anywhere from a few days or weeks to wear off. Guess it depends on the convention, their personal feelings of dubiness at the moment or state of the world. That is my opinion.
When mine first joined up his eyes actually glazed over like you might see in the movies, scared the crap out of me. My jw changed so much after meetings the kids noticed as well. Now it is not as much if at all on a regular basis. Maybe he got better at snapping between worlds? his jw life and then home to non jw wife & family.
From a purely psychological point of few it can be an interesting study. Just wish I was looking in at will not having to live it.