Somewhat of a power level, but I went on a Make-a-Wish trip a couple of years ago with a young kid who had recovered from cancer. He had been on a couple of rides before, but this was his first trip to a big amusement park.
He enjoyed the park, liked most of the rides he went on, still expresses an interest in going back. However, we had one of their Genie passes which allowed us to get in the fast pass line without reservations and the whole trip was free. We ended up spending about 100 bucks of our own money, and that was just for airport stuff on the way home.
If I'd had to pay what the trip was worth, I would have been on edge the entire time. Its so expensive at Disney, and unless you are super into things like getting your picture with Mickey Mouse, the park is really no better than any other average amusement park. Come to think of it, at other amusement parks you don't need to make dinner reservations months in advance, so in fact it's a little worse. It's also really big, so the small children who would enjoy it most are going to be exhausted after traipsing about the park for a few hours, especially in the heat.
If you like roller coasters, you're better off going to someplace like Cedar Point or Six Flags or even Universal Studios. I've seen people take out home equity loans to go on a Disney vacation, and it's absolutely horrifying. The employees are very nice, and some of the rides are fun, but it's simply not worth the money you'd spend on it. If you'd gone as a little kid, you probably would have had more fun in the pool at the hotel.