MK: I'll add my vote for CHH, it's our favourite CS place in MK. I love their tuna sandwich, and you can't go wrong with the chicken or fish selections either. I really want to try the grilled salmon served with steamed broccoli and couscous, but that tuna sandwich always calls to me, lol!
Epcot: Sooo many great choices here! In Future World, our hands-down favourite is Sunshine Seasons. I love the roasted beet and goat cheese salad, and the last time I was there I tried the Reuben Panini which was also delish! They have amazing desserts as well, we've had the chocolate cake, strawberry shortcake, key lime pie and all were amazing. They now have a Mickey Moon Pie which looks incredible and will be on my tray next visit! In World Showcase, our favourites include fish and chips from the UK, the shwarma platter from Morocco, tacos de carne or nachos from Mexico or one of the delicious sandwiches and wonderful desserts (Cloudberry Horn or School Bread

) from Norway. I've also had and enjoyed the cheese plate from France, which is served with crusty french bread, along with a Napolean for dessert. Heaven!
DHS: Not many great choices for CS here, but we really enjoy Starring Rolls for lunch, their sandwiches are lovely and their desserts are mind-blowing! I've tried the butterfinger and marble cupcakes and both are OMG! good. Even if you don't have a meal here, try to stop in for a snack, you won't be sorry! Alternately, Min & Bill's Dockside Diner has some unique sandwich choices such as a frankfurter in a pretzel roll or italian sausage with onions and peppers. Their vanilla and chocolate shakes are yummy. All the seating here is outside, as is SR.
AK: Love the pork sandwich or ribs from Flame Tree BBQ. And on a hot day, you can't beat the fruit plate for a cool change of pace. Hubby will often order the chicken and rib combo and I'll get the fruit plate and we'll share.

I don't really care for their desserts though, I find them very odd tasting, with an almost chemical-like aftertaste. Other people seem to enjoy them though, so it's probably just me.

I love the Yak & Yeti TS restaurant, but have yet to try the CS. It's on my to-do list though!
DTD: Wolfgang Puck Express, pretty much anything on the menu. We've tried many different things (rotisserie chicken, salmon, pizzas, sandwiches, pasta) and have never been disappointed. The creme brulee, cheesecake or frozen yogurt are all lovely for dessert (if you have room, lol!) If you're in the mood for a sandwich, you can't go wrong at Earl of Sandwich. We've had the Original, Hawaiian BBQ, Earl's Club, Full Montagu, Cannonballs and Italian and all received two thumbs up. I have to admit that my least favourite was the Original however. It was good, but not great. I found it rather bland actually. The Italian however, was full of flavour. You're restricted on the desserts you can have on the
DDP, you can't have any of the more expensive selections like the brownie bites and are limited to things like cookies, fruit cups, dessert pots, etc. At least that's how it was the last time we visited (2010), it may be different now.

If you find yourself on the West Side at meal time, I can also recommend Cookes of Dublin (next to Raglan Road). Their fish and chips, shrimp and chips, chicken and mushroom and fisherman's pies are all yummy. For dessert, you can have a deep fried Snickers or Mars bar, or choose from a selection of cookies, cupcakes and fruit cups. Seating is outside with very little shade however, and if you're visiting during one of the hot and humid months, you'll be very uncomfortable.
Enjoy your vacation!