Arrive at the parks late, and go back to your resort early. Relax, enjoy vacation, don't overtire the little ones. Disney is wonderful, but you don't have to see it all on your first trip. I have seen many families stress themselves and the little ones out trying to fit it all in. I know many people find
disney vacations expensive, and they want to try to get the most bang for the buck. But a highly enjoyable, relaxing, fun vacation, where every member of the family has fun is worth a lot more then a stressed out week of running to try to see all of the sights.
I know its a family vacation and you would like to stay together, but unless everyone is really easy going, go with the flow types, you will end up with everyone being annoyed. The 4 year old crying because he is tired of standing in line waiting for rides that he can't ride, and the teenager bored to death of the kiddie rides. Obviously you will want to stay together a lot but plan for some seperate time. Plan on naps for the younger kids, if you are lucky they will fall asleep in the stroller and then you can walk around and relax, but if not, take an afternoon break, or end the day early. Enjoy what your resort hotel has to offer.
We have been to Disney 10+ times and still havn't done it all. Its our goal though, to eventually eat at all the restaurants, ride all the rides, do all the activities, etc. But it will probably take us another 20 more visits to meet our goal. We normally only spend 5-8 hours at the parks. Any more then that and you are just running yourself to much to truely enjoy the trip.
Matthew