Olivias gets my vote too. Nice relaxed atmosphere (we go in September every time), attentive but not over-the-top servers and lovely food (and on DDP if you're lucky enough!!)
Crew's Cup Lounge at Yacht Club. You can even order many items off of the Yachtsman Steakhouse menu. The lobster bisque is FANTASTIC...the best you've ever had. The burgers and salads are also wonderful...and the service has always been great. Not a great spot for kids but for adults only, without an ADR especially, awesome.
I'd have to go with Kona for any meal. We like it especially for lunch....it's a quick boat ride from MK and a nice break from the park in the middle of the day.
Completely agree with Artist Point. It's at the top of my list of signatures, and I almost always love the food there. Love the relaxing atmosphere, too.
Another vote for The Turf Club at SSR. The meal was the best in our trip.
Our steaks were better than the ones we had at Le Cellier. Dessert was awesome too.
Breakfast at Rainforest Cafe in Animal Kingdom! I know RFC isn't a "secret," but the place is always empty for breakfast. They have the most amazing breakfast pizza & it's HUGE. I also like the oversized mugs of coffee. This has been one of my favorite WDW breakfasts for years.