Is this because you are on the dining plan? At that age, my kids didn't want to do a sit down meal every day. We still don't do one a day - so when we went a year ago (tried the dining plan for the first time, free) the first night we were really tired and got room service. It was a great treat, and the tip was even covered. The bill IIRC was well over $150 for myself and my kids! DH came two days later, so we had a couple of credits extra to use up.
Sometimes room service is nice when you're tired (but we've been so many times, that we don't mind resting in the room).
I agree about Tusker House! They have the same head chef from Boma, and the food is similar. But the nice thing is that it's at the theme park. We enjoyed DAK theme park for the day and did an early dinner there about 4:00. The food was excellent, and they have so many choices, for picky eaters and adventurous ones. My DS loves salmon and fish, DD is picky but they had nice choices. It was nice as DAK was winding down for the day (usually closes earlier than other parks).
We also have always had a great meal and time at the Sci Fi Dine In Theater place at DHS. It's fun to sit in the cars, and really the food is surprisingly great!
My kids have also enjoyed the teppanyaki restaurant in Japan at Epcot, I think it's still Mitsukoshi. They love watching the cooking. Very fun for kids, and pretty good food.
The Seas in Epcot is also a great place, with all the fish.
I didn't know T Rex was on the dining plan. But I've heard it's cool!
We're not huge breakfast eaters, as we'd rather have something light on the go, then sit down for lunch.