Gay Day's Opinions:
After several visits during the Gay Days, I have the following opinions:
First, Saturday at the Magic Kingdom is the only "park day" I've seen massively affected by Gay Days crowds. Pleasure Island on Friday and Saturday night can also become extremely crowded.
MK being crowded on this day is no different than any other crowded day. Expect longer lines. PI is a little different. The crowd is young and therefore, like any gathering of young people in a bar district after a 90 degree Florida day, they're loud, drunk, and obnoxious. No different than heterosexuals being loud, drunk, and obnoxious. We went on Saturday during this period in 2000 and found it somewhat un-entertaining. If I were younger I might have a different opinion.
If "avoiding" Gay Day activites is your choice, the schedule listed by bearzabout should be of great help avoiding things like Typhoon Lagoon on certain days.
All that said, my experience with the Gay Days is that beyond MK on Saturday, the crowds tend to be very managable, and the behavior is, quite frankly, far superior to a similar visit in mid-July. My wife and I will be in the parks June 6-11, we'll enjoy it, and we'll wear red shirts if that's what's on top of the clean pile that day.
Pat