I tend not to rewatch things anymore, maybe after 5 or 6 years if I really like something, usually with someone who hasn't seen it so I can share it with them.
Oddly enough I have absolutely no love for any further Ghostbusters sequels or the video games. As I said, I'm overly familiar with the first movie, I don't want to hear the same music I associate specifically with the Sedgewick Hotel playing during some other scene, or hear the same quotes or even see the same actors 50 years older. I want something new of the same quality and flavour of the era, which is pretty much impossible at this point in history. The themes, attitudes and imagery of the movie greatly influenced my interests and development as I grew up, even down to the clothes I wear today.