PD - We went this past May - the very last week. We took the kids out of school the last two days to beat some of the first wave of summer crowds. We went from a Wed to Wed and it included the Mem. Day weekend. I planned for heavy crowds and was surprised that it wasn't as heavy as I thought it would be. We used the UOG itinerary for MK, but the rest was not so heavily planned. We really accomplished a lot and included Blizzard Beach.
Many of the southern schools get mid March for Spring break (ours is like the third week of March). I'm not so sure we would ever do Spring break because I keep hearing of how bad the crowds were, plus the weather is iffy and we may not get to swim much.
I don't know how old your children are, but the events of the Epcot Garden show were appealing to me and my husband.
If I had to choose again, I would go again in May (and that's a hard choice because that would mean I would have to wait an extra 2 months!). The weather couldn't have been more perfect, crowds were minimal, and events going on were appealing to the adults.
Vic
(PS - we're going to Costco in just a little bit to pick up shrimp to grill!!! Might even get a hot dog for lunch. Can we pick up something for you???)