We try to plan this stuff creatively, to maximize the the days at WDW while minimizing the missed school days (kindergartner). DS will miss the Monday following Thanksgiving, that's a pretty reasonable compromise in my book for his grade level.
OTOH, our schoolboard has gone a little power mad, which makes me not feel quite so bad about our vacation scheduling. Case in point: Spring break this year will consist of Maunday Thursday, Good Friday and the following Monday. Yeah, right! 3 days! We're adding three days before so we can go from the weekend before Easter to the Monday after.
Otherwise our options would be limited to the family-unfriendly first weekend in June straight through the worst of the heat and hurricane season. Who wants to go to Florida when the weather finally starts getting nice at home?