Lol I dont do it with the controller at all, for any game, but I've noticed a lot of people go crazy with controller movements like they do in TV or commercials or they're playing with a motion sensing controller, even when they're not. This is nothing new people have been doing it from Nintendo/genesis days.
With a wheel in gt5 though I notice if I'm understeering I do lean, and sometimes plead with the car to make the turn.