I am a former high school teacher and current homeschooling mother. We do not "do school" at Disney. One of the great things about homeschool is that we keep our own schedule. My son started school two weeks ago so that he could finish 45 full days of school before we head to Disney September 26.
This vacation will be the break between first and second quarter. He is in mid-school and we love being able to adjust the school year to fit vacations which allow us a much smaller price tag and other perks (such as Food and Wine Festival).
I liked to reference Disney in problems we use at home. For example. If the sled for Rocking Roller Coaster with a mass of 2 tons, when fully loaded with guests, reaches the speed of 60 miles per hour in 200 feet, what is the force applied to the sled at launch?
(Note: I just made that up on the fly, and don't know if that is the actual speed, mass, or distance....but I usually do find actual numbers for problems we calculate, as that makes it a lot of extra fun.)
For young children, a trip to Disney, especially Epcot or Animal Kingdom, could very easily be justified as a field trip. It could even be a field trip for an older student with proper planning....such as a behind the seeds tour in combination with a study/report on innovative agricultural techniques.
My elementary aged son got a great lecture on the bernoulli principle (which explains lift and how planes can fly) when we flew to Disney once. The adult woman in front of us told us she learned more listening to us on the trip than she learned in all of high school Physics. Learning is a life long adventure, and as any kind of parent, home school or any other learning choice, needs to be willing to make the most of "teachable moments."