I second Gasparilla's for brekkie (and lunch, actually). It's one of the reasons I like staying at the Grand Flo. Gaspy's has good eats, IMO. They used to have this amazing chicken and brie sandwich...not sure if it's still there. Mmm...so good. And if you want a step up from Gaspy's, The GF Cafe is a good table service for breakfast (never had lunch/dinner there, so can't say).
I will say that one thing you have to keep in mind with the cost and food offerings/quality at character buffets is that people are paying for the experience with the characters as much as the food, and those places run a massive amount of people through due to their popularity. Also, it's geared toward children (as is most of the place...it's Disney World). That said, I enjoyed Cape May's breakfast and a dinner at Tusker House. I found Crystal Palace's breakfast just okay, and as a party of adults with no kids, I think we've decided enough with the character buffets already. It's a bit hectic and pricey, and...yeah.
I will say that we finally tried Liberty Tree on our last trip (Christmas) and I was underwhelmed (the table with the screaming child right beside us didn't help). And, unpopular opinion, but I wasn't all that knocked out by Le Cellier either...especially for the expense. It was...okay?
One of my favorite in-park meals so far has been Yak & Yeti (I know...not Disney owned). I also like Flame Tree BBQ in AK. Oh, and Boma for breakfast at Jambo = delish. Sanaa for dinner at Kidani = nice. But those are both out of the way if you're not staying there.
In MK, I'm always good with Columbia Harbor House for lunch/dinner. And, frankly, I don't mind a hot dog from Casey's. It's nothing special, but it's a decent meal and I love the location.
I pretty much NEVER eat at Hollywood Studios, and though they have a few intriguing table services (Brown Derby, Sci-Fi, 50's PT), I've just never felt enough of a need to try any of them (Studios is my least fave park).
Epcot's festival kitchens are always a good idea, IMO, and if it's a time when there aren't any, I like many of the QS restaurants around World Showcase. Again, it's not gourmet, but it beats "typical theme park food."
We've just learned what we like and we kind of stick with that, only branching out now and then to try highly reviewed signature or TS. We're returning to Boathouse this time, and adding Narcoossee's and Citricos since we're at the Grand and haven't tried them before. And we'll be trying the shrimp sliders at the pool. They used to have lobster sliders that were tasty, but the recent menus have them replaced by shrimp sliders. Either way, the house-made chips are always yummy.