I am a teacher. I know the importance of education ... and I know the importance of family time.
Unfortunately, most of our time (as a child and as an adult) is spent in school or work and not w/our families. Esp. if both parents work and the child goes to an after school program. I spend 40+ hours a week w/my students ... that is a lot of time to spend w/kids who aren't yours. I am the substitute parent as well as their teacher. Those children see more of me than they do of their parents on a school week basis.
Argue, if you will, that there are vacations (Winter & Spring Break) that children get off. However, how many parents actually take that time off to spend w/their child? Not that many b/c work doesn't allow them to. For some parents, it might be the "busy season" or they haven't racked up that much vacation time or perhaps there are too many parents who want that set time off and others cannot take it.
You can make up work, catch up on classroom things. However, the family experience is something you cannot make up. If you miss out on family time while in 1st grade you can't catch up w/it later on. It's lost time.
Disney is a great learning experience. As a teacher and a Disney enthusiast, it's easy to see. I can think of many Disney-based assignments I could give to my students. So many lessons to be learned ... Epcot, Animal Kingdom, Disney Studios, Magic Kingdom. I've had upper level students write reports on the workings of Disney rides (the scrims, etc.) as Disney Trip assignments. They were asked to select a Disney topic to write about ... and many came back w/the most amazing reports I have ever read. They were enthusiastic to learn about Disney animation, etc. and wrote based on their experiences at WDW.
Earlier this year, I had a student take 10 days off to travel to India. For whatever reason, she could not travel during school vacation times. She came back and had so many stories to tell. If she went to Disney, I'd have expected the same from her. Sure, she had homework to make up ... but the experience was more valuable than the work that she missed out on.
Learning is compromised of more than what is taught in the classroom. You need life experiences to go w/your education. Travel, regardless of where, is a life experience.
There's plenty of time to learn ... with family, you never know how much time you're going to have. You never know what will happen w/in your family ... so enjoy them while you have them.