For a "nice" meal - Le Cellier (love the cheddar cheese soup, the breads, and the steak - and the chocolate whiskey cake).
For a fun meal with plenty of yummy food - Biergarten (lots of great choices, great band, beautiful interior, but you do sit with other people if you are not a part of 8, which can sometimes be bad but usually is not at all, and can be fun!)
San Angel is beautiful, hard to beat the atmosphere - not the best Mexican you'll ever have, but not "bad" by any means (IMHO) and you can't beat the setting.
Chefs de France I found a bit over-rated, honestly. OK, and we'd go back and try a lunch instead of dinner, but it didn't come close to living up to all the hype. I think too many people get excited by the word "France" in the name!
Counter service:
Sunshine Seasons is by far the best CS in all of WDW.
Tangerine Cafe in Morocco has interesting choices.
Orange chicken in China (and the strawberry red bean ice cream!) is quite good.
Mexico counter service outside is almost as good (some people think better) than the inside San Angel TS resaurant.
Hard to ruin Fish n Chips from England.
Enjoy!