Working on plot ideas for prequels has me watching bits of the originals whenever I shift the point of view from which I understand the movies.

I don't really watch them all the way through anymore except perhaps once a year, and that's only the OT. I just watched parts of the PT recently, and it was so interesting because I haven't watched them in years, and I found that I don't really dislike them anymore. They're still bad, sure, but the feeling is one of morbid fascination now rather than dislike.