I don't---I want my kids to understand that you have to take care of business before you play. But, I've been informed that I'm the meanest dad in the world on a host of other issues (notably the Eat Most Of Your Vegetables If You Want Dessert issue and the Yes I Know You Are "Not Tired," But It's Bedtime issue) so I wouldn't use me as a yardstick.
We take our Disney Trips during President's Week (which our schools have off, and it's snowy here, so Florida and California both sound Real Nice) and deal with the higher prices and the larger crowds, thanks to mousesavers, my uncle with the Orlando vacation home (family discount!), TourGuideMike, and the Unofficial Guide. We chalk it up to the cost of doing business with school-aged kids.
We also pack *a lot* into our summers (beach, Grandma's lake, local amusement parks, trip to the Maryland grandparents, etc. etc.) and try to do fun weekend or evening things during the school year. Having a university in town helps, as most any week has 2-3 home sporting events plus another 2-3 cultural events---last week we went to a women's gymnastics meet, I paid a total of $3 to get us in between faculty/staff and school-aged discounts, and we had a ball. However, my DD6 now wants to quit soccer and take up gymnastics instead, so I suppose there is never a free lunch.