Yes, we were there last year over the holiday weekend. We usually go in early June and I really didn't notice that the crowds were any worse than that.
However, we are NOT park commandos and will often do 3 or 4 hours at a park and then enjoy life at the fort. So I'm not really sure you can judge by anything I say. I didn't even find going during Easter to be too dreadfully crowded and I've read that some people thought it was. We were at Epcot on Easter Sunday and it felt practically empty at times!