Universal Studios is full of overacting, extremely amateur, fresh out of acting school graduates (and those getting into acting school, as well.) I remember going on Jaws back in 2004 and my girlfriend (now wife) and I looked at the kid at the front of the boat as if to say, "Dude! Give it a rest!" He was all over the damn place almost to the point where when he grabbed for his gun to shoot the shark, he almost flipped over the side. When we got back to the loading station and we were getting off - I remember telling him to get his money back from the drama school he went to. You can act and pretend to give the guests the experience they're looking for, but when you overplay it.....kills the mood.
Disney....they're just fine! Some overacting, but not enough to get into a tizzy over. Disney all the way.