It does build up a horrible inertia though, for lack of a better term. I'll go to play a game or two if I'm killing a few minutes at my computer for whatever reason, and find myself playing another game, and another... I'll finish one game, and have the following dialogue with myself:
"Ah, okay, I won that game. Not bad. Okay, I think that's enough for me, I'll just go and..."
"Oh, I, ah, appear to be playing another game."
Seriously, I don't feel any great need to play it if I'm not playing it at the moment, but once I start, it's like it builds up its own gravitational field. Madness!