I enjoy wasting time driving like a normal person in games like GTA, or ridin' m'horse in RDR. And, now that I picked them both back up for my original Xbox, the True Crime games.
For the iPad, I enjoy Grand Mountain Adventure and Alto's Adventure.
That kinda thing lets me do something inconsequential while my mind tears itself apart. Same thing I'll do with a guitar, noodle for hours not paying attention at all.