You don't go to Chef Mickey's for the food. You go to eat with Mickey, Minnie, Donald, Goofy, Pluto and whoever else shows up! And, in that respect, you'll have a great time.
If you're looking for a GREAT meal, you won't find it at Chef Mickey's. Breakfast is decent enough, with lots of variety....and, really, there's so much at breakfast you can't mess up that you're virtually assured of finding a palatable meal.
Dinner is interesting. I've been on nights where the food is decent. I've been on nights where....let's just say it was not nearly as good. It was edible...but not much better than that.
Having said all that...WE (and especially my kids, one of which is only a couple years younger than you) have always had FUN at Chef Mickey's. Napkin twirling, dancing around, and yukking it up with Mickey and the gang seems to overcome how good (or not so good) the food might have been.
Keep all that in mind when you read some of the reviews here. They're absolutely right, in terms of their reviews of the food...especially when considering they're reviewing from the eyes (and with the taste buds) of an adult. I've never, ever heard my kids complain about the food....they're much too busy enjoying themselves! I'm not saying NO kid ever complains about it (I'm sure others will offer their own examples)...just that kids end up being more forgiving given what's going on around them.
You'll probably have a great time!