Here's a second for Kona Cafe. Almost every single item on their lunch menu is something unique that you can't get at any other WDW restaurant, or something that is similar but that has a Polynesian twist on it. We like trying lots of different things, not just the same old burgers and sandwiches.
I'll also plug Fulton's Crab House. It's a much more relaxed environment for lunch than for dinner and the prices for the lunch entrees are more reasonable for the amount of food that we typically eat. And you can still get Stone Crab claws at lunch when they are in season!