I like the thread!
Personally, I have a good memory of details. I hardly re-watch anything. If I do, I won't do it until I've forgotten parts of the main storyline (usually 3-4 years after the first time I watched it). Same goes for re-reading, except manga. For manga, I can re-read a story again only 6 months after, because I tend to forget the details if they're drawn and not in motion. (If that made sense)