Quote Originally Posted by SquirrlWrangler View Post
As far as I know, I don't do that or at least I'm not aware that I do it. I'll have to try it out consciously.
Lifting the mouse? Everyone does, you possibly do it every second or two without noticing. I can't imagine what sort of sensitivity and strange places you'd end up in if you didn't lift the mouse at all.

I'd bet a lot of maps tend to be biased in some way towards moving the mouse a certain direction, so it would be impossible to go the whole game without lifting the mouse once.