I agree- this weekend was NUTS!!! We just got back last night from a 4day weekend at CBR and the crowds were almost July worthy IMO. We had a game plan so we really didn't wait long for much that we HAD to ride, but by afternoon we wanted out of the parks because they were so crowded. Fantasmic was at CAPICITY level on monday night.
We usually go the next week but because I am in school I couldn't spare the time off- and we have gone in the past on MLK weekend but no crowds compared to this. For the most part on non-holiday weekends-weeks- you can get away with really low attendence in Jan and Feb and even March- but forget April (Spring break) but our fav resort WL was booked for this weekend and we couldn't get in (maybe that should have been a sign). May was nice too in past years. I didn't want to complain because it was just nice to get away, but I think the best time we had with crowds (or lack there of) had to be in late September. We were there in Sept the year before last and it was quite nice. Yes there were hurricanes to contend with but the crowds were low, the weather was BEAUTIFUL (warm, sunny and not really as humid as dead of summer) and we just kept a wide eye on the weather forcasts. We were also able to help out some of the local hurricane victims by bringing much needed supplies in our "spare luggage" which would be filled with souviners and stuff on the return trip. Felt like we were trying to keep the tourist industry alive and help some "poor unfortunate souls" that lost everything in the hurricanes.
(Sorry so rammy- Still on the Disney high from the trip)