We really enjoyed the Garden Grill. The character interaction was great and it's a buffet style, but the lazy way - they just keep bringing you more and more food. That would use a Table Service credit...
Otherwise, I would suggest you go into World Showcase for lunch - pick a country. My favorites are China, Germany, and UK. (orange chicken, brats, and fish and chips!).
We had lunch this past trip at the Electric Umbrella and it took forever! (Of course my husband needed a gluten free bun, so that's what took so long, but still, it was super crowded compared to the countries.)
Have fun at Whispering Canyon. My 2.5 year old LOVED it. (as did my 5 year old.)