Your children are the perfect age for Disney in my opinion. I have been going since I was about that age because my grandparents live near Orlando and I must say that Disney was as magical to my sisters and I as the idea of Santa when we were little. Our last trip, just the "kids" went (we were 23, 21 and 17) and we had such a wonderful nostalgic feeling of being all together with our parents and being as happy as any child could be. This is what Disney means to me. It's not about each individual attraction/store/restaurant... it's about how everything interacts as a whole to just bring this entire world of magic to children.
So I guess my tip for you is to try to make it as magical for your kids as possible. Not that it shouldn't be fun for the adults too! But I have seen some families there who look very agitated with each other, most likely fatigue, hunger, etc... and to me, that isn't what the Disney experience should be about. Before you know it your children will be grown up and if they love Disney now, they will love it forever and hopefully always retain a little bit of optimism and wonder that they felt while there.