I haven't doen the new Plaza Inn Character Breakfast but I have been to Goofy's Kitchen and Ariel's Grotto. Goofy's Kitchen has a buffet and it is loaded with stuff. It is a pleasant, contemporary atmosphere and there are lots of characters. It is usually crowded and boisterous. The food is good.
Ariels's has been a bit mellower with less characters but less people too. It has a contemporary "under the sea" decore that is pretty. The food is good here too.
As far as other places to eat in the parks and hotels.....
At
Disneyland the premier full service restaurant is The Blue Bayou located at the edge of the bayou where the Pirates of the Caribbean boats float by. It is similar to the San Angel Inn at the Mexico Pavilion in Epcot. Food is decent. Atmosphere is outstanding. The only other full service place in Disneyland is The Cartation Cafe on Main St. It is an out door sdiewalk cafe with sanwiches and soups etc.
I really like the Plaza Inn for lunch or dinner. It has a small menu and is sort of cafatieria service but the food is good and the decore is fancy (similar to the Crystal Palace but more frilly), unless you eat outside at the tables with umbrellas.
The French Market is also cafateria style and has had good food.
At Rancho Del Zacolo I have been disappointed in the Mexican food but haven't tried the BBQ side yet. This is a counter service / cafateria but has a nice atmosphere.
Redd Rockets Pizza Port(another cafeteria / counter service) has just okay pizza but good pasta and salads and a bland atmosphere.
At DCA Ariel's Grotto is good. The Tratorria at the winery was decent but nothing special. The Vineyard room is expensive and looks nice but has a more upscale menue. I haven't tried it yet. The rest of the places are all counter service. Pizza at Pizza Ooo Mow Mow was uninspired. I have yet to try the other places. There is a full scale McDonnalds masquerading as a place called Burger Invasion. There is a Mexican food place and soup and salad place in Pacific Warf but I haven't been inspires to try them. Have heard good things about the burgers at Taste Pilots grill.
At the Hotels I like Hooks Point at the Disneyland Hotel, as well as Goofy's Kitchen. At the Grand Californian I like Storytellers Cafe a lot.
I am sorry I don't know about the food vouchers. I would assume that all the park restaurants take Disney Dollars and think the hotel restaurants do. I know they don't take them at Downtown Disney restaurants.