Usually at that age the dining plan may actually be worth it and then the more character meals the better. I hate standing in the hot sun waiting for characters so if I can meet a bunch in an air conditioned restaurant, I'm all for it. Disney Jr. is the only thing I think they would be too old for. It's the only character meal I would avoid on a solo trip as an adult, the rest are good for any age! For the princesses, I'd pick Akershus. It's really cool to eat in the castle, but with the cost of it I'd do Akershus and then breakfast or lunch at BOG for the castle effect (breakfast is better but costs more, both are one quick service credit though so if on the dining plan go for breakfast if not go for lunch). Then save CRT for the next trip so there will be something new to look forward to and you can pair down some of the others. Chef Mickey is great, kids think its SO much fun to eat and watch the monorail go by. You can see the same characters at Tusker House with a more adventerous menu and better food, but if it's what the kids prefer, I'd lean a bit toward chef mickey. And now that I see you are staying there, yes you really should do it or you'll hear it from your kids every time you pass can we go there!
1900 Park Fare is also great, some of the best character meal food in my opinion. I would say go with the breakfast or skip it this trip, I think your next trip when the kids are a little older they will get more out of the dinner. There is a lot of humor with the step sisters and it will probably almost all be over their heads at this age.
One other meal that I love is Tratorria on the boardwalk. For breakfast it has ariel, rapunzel, eric and flynn. The meal is great and if you have enough days I would check it out, but if you're limited to 5 or 6 days, I'd save it for next time.
Crystal Palace, I do occasionally because I love Eeyore, but their food really is bad. They also can have very long wait times. I think we had bad luck though because it was raining so people didn't want to leave the restaurant. The kids didn't mind the wait and liked the characters, but it did mess with a few of our plans. If your kids like winnie the pooh go for it, its a cute restaurant, if not, skip it.
I can't comment on Ohana, I've never been there as their menu doesn't appeal to me and it gets mixed reviews. I loved Garden Grill but I feel like that could wait until next trip. I've also never done Cape May because we usually pick a restaurant that also has Mickey there.
I've actually NEVER been, but we're staying at the Contemporary so I had a feeling it was unavoidable this time around.
