We left MK once to go to Contempo Cafe. The food was very good for QS, the desserts are pretty too. It's quite loud with Chef Mickey's right next door, but it's fun. I wouldn't go out of my way to get there, but if it works with your schedule, and you've never been to CR before, do it. I did find the Mary Blair mural and monorails wizzing by overhead quite nice.
On our next trip, DS *really* wants to try Tonga Toast, so we will head to Captain Cook's for the first time. I find this a PITA because we have to get there during breakfast hours. This will be the first time we have Hoppers, so I was thinking of RDing MK, going to Captain Cook's, then taking the monorail over to Epcot afterwards (something we've never done). Basically, I will build our day around that Tonga Toast *sigh*