My favorite is California Grill at the CR! The view is just beautiful, & the food is wonderful too. I'm excited to see what it will be like after the refurb. However, if you're on the DP, it's 2 TS credits.
We also like 'Ohana & Kona Cafe.
While Kona Cafe doesn't have the "atmosphere" that 'Ohana has, in my opinion, the food is just as good. DH really enjoyed the Tuna Oscar, & we got a sushi plate from the sushi bar. 'Ohana is fun, & one of my family's favorites. However, if we couldn't get an 'Ohana ADR, DH & I would be perfectly fine w/ Kona - our kids would probably miss 'Ohana though.
On my list of places of try is Narcoossee's at the GF - it's been on my list for years, but I can never seem to work it into our schedule.
I've also had a breakfast ADR scheduled at the GF Cafe for the last 3 trips & have ended up cancelling each time because we've decided we'd rather sleep in. I have another ADR scheduled there for our next trip in a couple of weeks - we'll see if we make it this time!
Cinderella's Gala Feast at 1900 Park Fare looks fun too w/ the Tremaine sisters & Prince Charming, but, since we're not that crazy about buffets & already normally do 2 (Crystal Palace brunch & Chef Mickey's breakfast), I've hesitated to schedule it.
Not on the monorail line but a quick boat ride away from the MK is Whispering Canyon Cafe at the WL - very fun atmosphere! It's probably my kids' favorite restaurant. We used to either do Whispering Canyon Cafe or 'Ohana - the overall experience (while one is Hawaiian & one is Western) is similar in my mind, but, now, we normally try to make room for both places in our schedule - our kids love both.
The food is not as good as 'Ohana, but it's okay, even good - we've been there when the food has only been okay, & we've been there when we've had a really good meal too - it varies at WCC.