From what I have read of tohers who have experienced WDW and THEN DL .. you will likely find that the retaurant choices in DL are more limited.. also no need for PS EXCEPT for Blue Bayou and any of the Character Dining venues.
I've only been to DL/DCA .. my top choices are:
DL:
Blue Bayou (inside Pirates) -one of the few seated/waited on places, make reseravations 30 days in advance, Lunch is cheaper, ask for first possible seating, when you arrive be a bit early and request water side seating.. if you need to wait--- do it! It's worth the wait to sit by the water. Splitting a meal is fine and that is what I usually do as the portions are large. Lots of people rave about the Monte Cristo.. it was good but I enjoyed my SIL calamari (appetizer she ordered as meal) and my DH clam chowder much more than the Monte Cristo which seemed too heavy of a meal.
Rancho del Zocalo - mix of Tex Mex and BBQ offerings.. HUGE portion sizes, feel free to make requests / substutions, free refills, the line is chaos but they have CM there to help you get in the right place according to what you are ordering. Very yummy!
Carnation Cafe - Main street- lovely outdoor cafe , sit down/waited on, no reservations, nice breakfast.
Riverbelle Terrace- near ROA - nice place to have breakfast, Mickey Pancakes or the eggs and potatoes meal are the best. Sit and watch the river traffic outdoors and the peaceful quiet as most people are busy at the front of the park in the morning.
DCA:
Taste Pilot Grill:
Next to Soaring- burgers an dfries but think of them as restaurant style burgers not fast food types. They have a top your own burger bar of salad greens, salsa, pickles. The chicken burger is yummy!
GC Hotel:
white Water snacks - haven't eaten there yet but many rave about the prices (cheap) , portion sizes (large/ shareable), location (quiet), and the food is freshly made with your order.
DTD
Rainforest Cafe-- no brainer there..
Haagen Dazs- MMMMMM
Wetzel's Pretzels- cheap snacks and fairly good cup of lemonade.
Character Dining:
GOOFY"S KITCHEN - located in DLH - lots of charcaters and more food then you could imagine.
Have fun!!