The week after Thanksgiving has always been wonderful when we went. Especially compared to the week of Thanksgiving. Sunday is thinning out and Mon on is wonderful. I will however say that this past year 2005, was our first ever Summer trip to WDW. I was really scared. It turned out to be wonderful and it wasn't that crowded in my opinion. Maybe my idea of not that busy or decently manageable is skewed? I know what it's like over Thanksgiving and that is busy. Or, maybe I've just perfected (after 11 years of going to WDW) our touring plan. As of late we don't do the Early or Late entries and it really works great for us. I think a lot of it is what park you pick, how you work the park, etc. Even in the slowest of seasons there is still a LOT of people at WDW, it's all relative to what you've experienced in the past.