Disney Quest was my favorite "park" in Orlando. On an anniversary trip, my wife and I spent most of a day there (taking a break to see Cirque du Soliel). We also found it far more relaxing than a day at a regular park. We played several of the "headliner experiences" several times.
DQ has what are probably the best virtual-reality games ever created. It has many of the current arcade games, as well as many of the classics I remember from growing up (space invaders, pac-man, centipede, etc.). There are also animation classes, a bumper-car variation, and some other non-game things (like photo manipulation and build-your-own toy). Almost all games are no charge (once you are inside). Games that I'd never pay $1/play for at an arcade I could try out for free. The only exceptions are some of the ticket-dispensing games (but, even these I found to be generous compared to the usual ticket games at our local arcades) and those (such as build your own toy) where you take something significant away.
We did go at a relatively slow time (during the week in September), so if it were crowded, I could see how that would change things.
That said, we probably won't go on our next trip with our 4 y.o. - most of it she would not find that interesting. But an older kid, or adults who enjoy games (such as me...), will probably love it.