I also don't think that most movies are worth the time from an educational standpoint. But there are some entertaining movies which if watched with a frame of mind where you don't immediately forget what you saw (e.g. not admiring the special effects and great acting) but think while watching (e.g. reflecting the multiple levels of struture of the movie from dialogs to motivations to topics to plot) then you can take something home while still having fun.

Movies are some of the most complex and dense products on earth and if they weren't primarily be made to hook you emotionally more would learn from them as complex items.

Here is a list of movies that may be interesting for LWers: http://c2.com/cgi/wiki?MoviesToConsider