Yes it is! And their food is very good!
As far as good CS places in the parks go, there are MANY!

Let me break some of my favorites for breakfast, lunch, and dinner in each park:
Magic Kingdom:
In Adventureland:
- Aloha Isle (for a snack, the infamous Dole Whip

)
In Fantasyland:
- Storybook Treats Ice Cream- formerly Mrs. Potts' Cupboard (again, snack, but some real good ice cream sundaes)
- Pinocchio Village Haus (QS with a pretty good selection of things like salads, pizza, subs and even chicken parm, you can even watch the boats of IASW going by from some tables!)
In Frontierland:
- Pecos Bill Tall Tale Inn & Cafe (best burgers around! and don't forget the yummy fixin's bar! plus other options like bbq sandwiches, chicken wraps, and taco salad)
In Liberty Square:
- Sleepy Hollow (for a snack, get a loaded Mickey waffle or a delicious funnel cake!)
- Columbia Harbour House (yummy sandwiches, salads, and seafood baskets with delicious sides and desserts)
On Main Street U.S.A.:
- The Plaza Ice Cream Parlor (this place is a classic for a sundae in a waffle bowl)
- Main Street Bakery (for breakfast or a snack, they have the most delicious pastries EVER...like those massive cinnamon rolls, ice cream cookie sandwiches, and croissants. they also have bagels and fruit and croissant sandwiches for breakfast, as well as other sandwich selections for lunch and dinner. this place is a must-do.)
- Casey's Corner (the best hot dogs in all of WDW and a personal favorite. and you can watch the parades and/or Dream Along with Mickey while you eat lunch, or Wishes while you eat a late dinner. the location is great

Casey's is a classic

the corn dog nuggets are also yummy)
In Tomorrowland:
- Auntie Gravity's Galactic Goodies (great smoothies, and healthy too! Made with yogurt not ice cream)
- The Lunching Pad (for a heart attack hot dog

)
- Cosmic Ray's Starlight Cafe (another personal favorite- this place has lots of available seating all the time, and tons of great selection like chicken and ribs, burgers, hot dogs, sandwiches, salads and wraps)
Epcot:
In Future World:
- Electric Umbrella (this place is so cool, and there are salads, burgers, subs and wraps, so everyone gets what they want)
- Sunshine Seasons (this is the QS with the most variety in any park, not including WPE in DTD-there is tons, i mean TONS of good food, like Asian noodle bowls and sweet and sour chicken, cool salads like roasted beets and goat cheese and seared tuna on mixed greens, flatbread sandwiches and my favorite, the turkey and monterey jack with chipotle mayo and a side, rotisserie chicken and pork chops and grilled salmon, grab n' go items like sushi, salads and yogurt, and finally the most yummy selection of desserts EVER, my personal favorite being the strawberry shortcake, it's like HEAVEN- yes, something as simple as strawberry shortcake, but this is no ordinary strawberry shortcake, it's like layered and scrumptious. there is also a very delicious and creamy creme brulee, muffins, danishes, croissants, crumb cake, fruit tulips, key lime pie, cheesecake, flan, and brownies and blondies.)
In World Showcase:
- Lotus Blossom Cafe (China- the shrimp fried rice is great, and so are the egg rolls. the CMs are always very friendly. there are also potstickers, orange chicken, stir fries and sesame chicken salad. and for dessert, the red bean ice cream is so delicious. it's like the best hidden gem EVER.)
- Boulangerie Patisserie (France- croissants and breakfast quiches, as well as quiches for lunch and dinner, baguette and croissant sandwiches, and the most fabulous array of pastries that WS has to offer.)
- The Yorkshire County Fish Shop (UK- fish and chips and shortbread-that's all they serve- but let me tell you it is SOOO good. my fave QS in WS. the fish just melts in your mouth and the chips are crisp and yummy. the shortbread is fabulous.)
- Yakitori House (Japan- shogun, tempura, udon, curry, teriyaki, salads, and of course, sushi. a wide array of authentic foods and flavors, all are fantastic.)
- La Cantina de San Angel (we mainly love the location of this QS- right on World Showcase Lagoon. late at night, watch Illuminations while munching on chips & guac, and tacos, empanadas, and nachos for lunch.)
- Tangerine Cafe (many will say this place is the best QS- and I agree that it certainly ranks somewhere at the top- the shawarma platters are delish and filling, and we love the atmosphere of all of Morocco.

)
- Kringla Bakeri Og Kafe (there are gourmet sandwiches with soup for lunch and dinner, but we mainly go here for a snack, AKA SCHOOLBREAD

and also berry cream puffs, cloudberry horns, lefse, and sweet pretzels- all delicious.)
Hollywood Studios:
On Sunset Boulevard:
- Starring Rolls (yummy foccacia sandwiches, and the cupcakes are to die for

you absolutely cannot miss this place

)
- Fairfax Fare (chicken, ribs, pulled pork and salads, this place is yummy but not alot of people know about it.

)
On Commissary Lane:
- ABC Commissary (I personally like this place alot, there are interesting choices, like chicken bleu, chicken curry, and asian salad. they also have burgers and fish baskets. this place always has plenty of seating, as well as some great AC in the summer

)
By Echo Lake:
- Backlot Express (grilled sandwiches, southwest salad, hot dogs, burgers, and chicken. pretty basic, but still nice and convenient.)
On the Streets of America:
- Toy Story Pizza Planet Arcade (Like right outta the movie, and the pizza is yummy. it comes with salad too, so you're always far from hungry. you can order just a bigger salad too.)
- Studio Catering Company (cool sandwiches, wraps and salads make for some yummy food and a shady seating area)
Animal Kingdon:
In Africa:
- Kusafiri Coffee Shop and Bakery (check out their cupcakes for a snack, close second to Starring Rolls

)
- Harambe Fruit Market (this is where you can get the Jalepeno Cream Cheese Pretzel)
In Asia:
- Yak and Yeti Local Foods Cafe (honey chicken, sweet and sour chicken, orange beef, mandarin chicken salad and more- yum

)
In DinoLand U.S.A.:
- Restaurantosaurus (burgers, po boys, subs and salads, plenty of seating and plenty of AC)
On Discovery Island:
- Flame Tree BBQ (this place's smell will draw you in- it smells soooo so good! ribs, chicken, pulled pork, all with their famous rub. also salads, sandwiches, and fruit and yogurt plates. key lime mousse for dessert!

)
- Pizzafari (best QS pizza in all of DW- served with caesar salad, they also have antipasto salad and italian sandwiches. such a cool atmosphere, this place is SO artistic and colorful, with cool themed dining rooms and plenty of space. they also have breakfast here- breakfast pizza, breakfast platters, french toast, cinnamon rolls, yogurt, pastries and fruit.)
Downtown Disney:
In Marketplace: (all are)
- Cookes of Dublin (fish and chips, scallops, shrimp, fisherman's pie, salads, and fried candy bars make up the quaint Irish pub-style QS)
- Earl of Sandwich (like the Panera Bread of WDW. this place has TONS of different sandwiches, wraps, and salads, and although I recommend the BLT, they are all delicious!

don't forget some bread pudding or a brownie sandwich for dessert!

)
- Wolfgang Puck Express (last but most certainly not the least- this place has the most options anywhere. from breakfast selections like breakfast pizzas and waffles to different soups, salads, sandwiches, pizzas, platters, and delicious desserts like creme brulee and frozen yogurt, this place is a winner any way you slice it

)
So there ya go! I know it's alot, but hopefully you can narrow it down to your personal tastes and cravings.
Happy planning!