I have only been visiting WDW in recent years so don't have the past to compare it to, but I have been very pleased with the food just about everywhere.
Of the parks, MK seems to offer the fewest food options and least variety. I'm not much of one to go for the hamburger/chicken finger places, but I always hit either Pecos Bill's or Pinocchio's Village Haus for the hamburger fixins station. That really is a great added value that the burger places in DL could take a lesson from.
I also really like the Cantina de San Angel in Epcot. That's a must stop for me at least a couple times each trip. Also a reliable place to pick up a churro for those DL churro addicts. And here's a tip I learned after a little investigating. The restaurant on the inside of the Mexico pavilion, the San Angel Inn, serves several of the same menu items as the Cantina outside but for considerably more money. I asked one of the hostesses and she said it was in fact the same food. So, unless you are in the mood for the romantic Blue Bayou-esque atmosphere of the Inn, you can save a little money out at the Cantina. I've also had good experiences at the counter service place in Japan and the sit down restaurant in Morocco.
I have yet to try some of the more popular places at MGM, but I have had steak at Sci-Fi and the cobb salad at the Brown Derby and I thought both were very good and appropriately priced. Actually, I should say that the first time I had the cobb salad it was skimpy and not worth the money. But since it always gets such rave reviews, I gave it a second chance on another visit and it was great.
A couple of favorite places of mine are the Sassagoula Floatworks and Food Factory at the French Quarter resort and Fulton's Crab House in Downtown Disney. The restaurant at the French Quarter is just great for relatively inexpensive, quality meals with a cajun/southern theme. Fulton's is great for splurging on pounds of king crab. Tastier and cheaper than it is in Seattle, too.