We have been twice--both times to the first show with Mickey & Company. At the time we went, our daughter was a preschooler (2 & 4) and our son in kindergarten & 2nd grade. Both loved the show--in fact, my husband and I (and my sister was along on one occasion) enjoyed the show, too.
The first year our kids tried the food offered and didn't care much for it. They were brought a box dinner that contained a bit of everything, PB&J, mac & cheese, a cookie, and I think chicken fingers. It's been a long time ago, so it's tough to remember exactly what alternative foods were included--I just remember it was a good bit of food for a kid. During our 2nd visit, our kids ate the luau food and our nephew had the kids' box meal. You just need to ask for an alternative for the kids--unless that's been discontinued over the years--I would highly doubt it though.
Now, as to the food--so-so at best.