Anonymous wrote:OP here again. We work full-time and will be taking the week of spring break off because the school is closed. The only times we would be able to go are during the summer, spring break or christmas break. I guess we will be screwed as far as the overcrowding. I appreciate all the links and will be doing some more research. If I can't pull it off for spring break, I will try for the summer where we can have a longer vacation.
OP, I would suggest mid or late August. It will be hot. But the crowds are SLIGHTLY better than Spring break and Winter break. Some of the resort prices go down in August (usually the Deluxe resorts), so that is another plus. Spring break and Winter break will have "full" pricing in effect.
Another reason I am suggesting you wait until August - or even next year - is to fully do the research on the parks and the options. Definitely sign up at the WDW website for their email list for announcements on promotions/reduced rates. Figure out if your kids will even want to go to a particular park. Some people have recommended Park Hoppers, others are saying don't get them. You'll have to figure out what makes sense (and cents) for your family. Park Hoppers are not cheap, but CAN work to the benefit of some people.
A lot of people stay on site to get the Extra Magic Hours benefits. I do recommend staying on site, but don't recommend going to those EMH parks during the day. Pick another (non EMH) park and go to that park (or parks) due to lesser crowds.
An average day of WDW includes 5 miles of walking. Be prepared for your patience (with your kids, the other tourists, and even your spouse) to be fully exercised...
I don't recommend the Water parks. I heard they are fun... but really don't think the water parks are the point of going to WDW.