Our first trip to WDW was just after DDs 8th birthday, and we went the beginning of May. Very nice, low crowds, I think Dad had the only meltdown on that trip. Second trip was in Sept., nobody there, my turn to melt down. Alicia has always been happy in the parks, until she hit the teens. When she and I were there last August, she whined quite a bit, mostly about the heat. So those of you with young kids, the whining returns after a while. Enjoy those nice in between years.
Actually, there's nothing like MK at night, during E-night, when you can do the rides multiple times and not run into a single stroller. Unfortunately, E-night is no more. I hope EMH is close. My favorite place is probably World Showcase though.