My wife is a teacher with a strong work ethic, so when we do have kids it'll still be a moot point-she can't/won't leave work for a week to go to WDW on the off-season. But I understand and agree with the concept that you need to do special things with kids once in a while, it makes great memories, strengthens bonds, totally get it.
The problem I have is with parents who give a teacher so little warning or no warning before taking their kids out of class. To me, that, more than taking your kids out of class, is what shows a disrespect towards education or educators. Worse, parents who just call the kids out sick. If you want to take your kids out to a vacation anywhere, tell the teacher as soon as possible. And instill in your child a sense of responsibility, maybe do more work before the trip so they;re ahead when they leave and the rest of the class can catch up. Hell, at my job, there are things I do that would be difficult for anyone else to do, so I plan ahead and get stuff done early before I leave, and leave copies with other people in case it needs revision or review. If possible, a kid could and should read ahead, do assignments ahead of time. Then when it's trip time, they don't have to do much extra work. But it involves the child and the parents accepting that they have responsibilities, and honoring those responsibilities is sometimes inconvenient, but always necessary. I would guess most teachers would appreciate a kid wanting to learn faster, show a willingness to learn. And a trip to WDW seems like an excellent incentive to get kids to think that way.