A few posters seem to have taken this a bit harsh. Everyone is entitled their opinions (hence your responses to OP are just that .. opinions just like the OP's might be in response).
Here is mine
If you are taking your kids out of school to their detriment (immediate); then that is a serious issue.
Otherwise, if there is no ill affect and you have figured the average time your child misses school a year for normal items (sickness, family emergencies, holiday travel) and the time you add to go to Disney is not putting you near getting in 'trouble' ... what is the issue?
My children will be missing school this year and next year. I have teachers in my family that have NO issue with this (their aunts and uncles) because:
(not in order of importance)
A: We are VERY involved in school activities
B: I am lucky and have two very bright children in AP classes, which involve MORE work than the average student but causes them little issues in catching up
C: That is the time that works for us as a whole, for true family time
D: Who doesn't want to avoid crowds (OP's original reasoning)
Teaching is hard and thankless, especially in todays society it seems. There are always exceptions to every rule and the above is my situation and might not reflect others. I beleive in making a blanket statement, that shows a narrow view. Have I been accused of a narrow view? Oh yeah, and most likely do in some areas, heck who doesn't.
I don't think anyone is wrong here unless they are forcing their OPINION on others. This is to all posters who feel the need to 'fight' for their opinion rather than simply state it. I don't agree with the OP if they think ALL kids should ALWAYS be in school regardless, but that is their opinion. I also do NOT agree with other people who say 'school isn't as important as it used to be' because that shows me your child might not become a contributing member to our society (that is MY narrow view and MY opinion). I could continue but you get the gist
Last note: I do feel for the OP who obviously wanted to plan a crowd free (as much as possible) vacation, and understand the frustration that might have prompted the original post. Just because opinions may differ, doesn't mean everyone and everything else is wrong or right.