Most of the time I do. A lot of the time, there's fantastic music playing, so I usually acknowledge that. However, I guess that would be considered listening to the credits rather than watching them. In fact, unless there's something going on on the screen that isn't just names scrolling against a black background, I usually just turn my gaze away until the credits are over. In that case, the only games I can think of where I actually watch the credits are Shadow of the Colossus, Ace Combat 5, any game that shows video or screenshots of your past escapades like REmake, SA2, or Mario Galaxy.