I think splitting CS meals is a great plan. We always share so that we are not eating too much at any one meal, and then feeling lethargic in the parks. My DD and her DH like a "real" breakfast so we generally hit the CS in the resort and order a few of the bounty platters, whatever that happens to be at the resort. I don't care for much in the morning, so I will have a little of their meals, maybe a piece of sausage and some of whateve is on the plate. My DGD does the same becasue she is not fond of too much in the morning. We almost always share lunches in the parks, some of those restaurnats have large portions, and when you add the dessert, you have a huge meal.
In the MK, my DDIL and I are planning on sharing lunch. WE have an ADR at BOG, and while I love the braised pork, it is huge! AT Cosmic Rays there are combination platter, ribs and chicken with a potato and veg, that is more than enough for even the healthiest of two appetites to share. Pecos Bill and Columbia Harbor House also offer generous portions.
In DHS there are several QS that have generous portions. We have not eaten at
ABD COmmissary in quite some time, but I remember some interesting meals on the menu. I als saw that Fairfax Fair had larger meals on their menu. We ended up at the Backlot Express twice last time because my DH was craving burgers, and theirs were really good. When you add their gynormous delicious cupcakes, my starving DSIL and I shared that meal!
I know that you are looking for CRT, and I think that on the dining plan, dinner is the best value there, but in the event you cannot get the ADR you want, look at other special 2 credit meals. I think the best signature dining value is Narcoossess in teh Grand Floridian. My friend and I were paying OOP, but we ordered the $77 lobster and steak dinner and asked to split it in the kitchen. It was still plenty for both of us, and we had no room for their luscious desserts, which we ended up having to take to the resort with us. You could plan dinner to be timed with WIshes, and that in itself is special.
1900 Park fare in the Grand is a buffet meal that features the Tremaine family and Cinderella and Prince Charming. The stepsisters are a hoot and your daughter will stil get her CInderella fix.
If you want to pay one meal OOP, think about 'Ohana in the Poly. This breakfast is one of the best values if you are paying and features Stitch, Lilo, Pluto and I think MIckey. The food is AYCTE, and is brought to your table. If you choose this meal, you could plan it on a day when you are going to a park later rather than at RD, and you could skip lunch altogether. It is plenty of food, and fairly inexpensive as far as character meals go.