Here are my recommendations for breakfast:
Ohana
Boma
Boatwrights (at POR)
For dinner I guess it would depend on what park you're in so here are my recommendations for each:
EPCOT:
San Angel Inn - Mexico Pavilion
Coral Reef - Future World
Magic Kingdom:
Remember, no alcohol in MK!
The Plaza Restaurant
AK:
We really liked Yak & Yeti but a lot of people have said the new Tusker House is really good.
We've also had a better experience at the Rainforest Cafe here, than what we had at the one in DTD.
MGM:
Mama Melrose's was really good when we ate there...people have complained about it but we definitely liked it and will go back. The Brown Derby is expensive but I've heard good reviews about the food
If you're at DTD:
Again, we really like Planet Hollywood but a lot of people complain about it. We have never had a bad experience and have eaten here on all 7 of our trips. Portobello Yacht Club also gets great reviews but I've never been there.