My answer is that I usually do not.... but there are a few classics that I will watch after a few years of not watching, such as Clint Eastwood....
Now, when I was young, a friend and I used to watch Star Trek and we watched so often we could say which show it was in 15 or so seconds... sometimes it only took a few...
Today, there are so many more options that I really do not want to watch again.... however, my gym has a movie room and I usually go in there and watch 45 minutes of whatever movie they are showing... some are really bad and I go back to the real gym, but some I just use to take my mind off the tread mill...