WOW! Do your little ones like to go to restaurants? Seems like a lot of work with little ones that age, but that's just me.
We don't do ONE a day, maybe one every two days at most. The waiting to be seated, waiting for the food, waiting for the dessert, waiting for the check, etc. drives us crazy. Plus we don't want to be weighted down by a lot of food.
Buffets are basically the best for us. Other than waiting to get seated, there's no more waiting and you can stay for as long or short as you want.
For an example, we went in January for 10 days. We ate at CMs on Sunday, Grand Floridian on Wednesday and Whispering Canyon on Friday. We felt SO full by Friday that we almost didn't go out to eat, but it was raining and we were already back in our room, so we tried it. I think I was up half the night feeling too full.
Will this be your only trip, or will you come back again? If it was me, I'd save some of that $$$ and just plan another trip in a few months!
Honestly, the food isn't that great - but the character experiences and fun themes are worth the time, at least once. Good luck deciding!