No, you're normal. It's just us few lucky ones, that really get into the game.
I don't peek around corners so much. But if I get into a firefight, I'll move the controller around. When I relieze I'm doing it, I'll look around, and see if anybody saw me . And there's nobody home. :D
I am guilty of the peek around the corner/head move, as with the racing games I tend to lean with the controller to the side I am turning. I remember back in the old days of the original Super Mario Bros, whenever my dad tried to make a difficult jump he would raise the controller in the air with his hands while he did it, like it would make mario jump higher or something. Good times