I thought Disney Quest would be a good idea, too, until I tried it once on a day when it was pouring. We had to stand in line forever (in the rain) to even get in. Apparently everybody else had decided the same thing.
Once we got in, it was so crowded that you really couldn't do anything except wait in line for the games. It was the worst I had ever seen it in about six - eight visits.
I don't recommend rainy days there.
Sheila