With all due respect, my fiancee, who is a school teacher, HATES parents like you!!!
But between you and me and the internets, I don't blame you one little bit for wanting to go when the crowds are light! :lol:
Those few weeks after Thanksgiving but before December 20th are, by most accounts, THE flat-out best time to go to WDW. Crowds are usually incredibly light (excepting the weekends when locals arrive), and the weather is bearable. The only caveat is that the parks will close earlier, but you'll probably get more done in less time because of the lack of crowds, and have more time to do more tradiational, non-Disney vacation-y things, like ride a bike, or mini golf, carriage ride, etc. The Unofficial Guide to WDW says that the things most Disney-goers do, like make schedules, rserve every meal, is rarely if ever necessary in this time frame