We love DTD but never spend a whole day there, though we do get over there more than once during our trips. I agree with Earl of Sandwich and Wolfgang Puck's Express for CS meals.
We have done Cirque and it is an excellent show so if you are planning a whole day at DTD, you might want to look into this.
We haven't been to DisneyQuest for years, since soon after it opened and it was still pay as you go. I refuse to pay a flat admission fee as I don't think it is worth it.
There is a movie theater at DTD so you could always catch a movie.
Obviously, shopping is the main attraction.