Well, since planning a trip to Playa, I've spent a lot of time here and on the TripAdvisor forums (and actually any other forum I could find on the PDC)... but I like this one best
I also visit the Disney forum you linked, spent many an hour on those boards. You're right though, I'm amazed at what people will talk about
Last year when remodeling my kitchen, I spent a lot of time on the kitchen forum at Gardenweb.com Loved that forum, and helped me get thru the stress of remodeling.