We took our family to Orlando to both Disneyworld and Universal Studios. It was extremely crowded, very expensive, and if you wanted to get in more than a couple of major attraction rides, you pretty much HAD to purchase the "jump the line" pass for another few hundred bucks per ticket holder. We took our elementary school aged kids and it was $4-5k for a few days for park tickets and food (not including travel and hotel expenses). Everything was egregiously expensive and the waiting around, even with the "cut the line" passes, were still fairly long.
I can't imagine how most people out there can afford the expense once you layer in the travel costs. I can only assume that many people are borrowing money to make it work. When we got home the kids said they had fun, but they didn't want to return. Whew....