We just finished a very pleasant breakfast at Disneyland Hotel's Steakhouse 55, which is tucked behind Goofy's kitchen. We were immediately impressed by the elegance of the ambience, jazz music playing in the background combined with old black and white pictures on the walls creates a very, dare I say, 1955 sort of feel to the place. I found the seating to be extremely comfortable and the service was fantastic. I ordered Huevos Rancheros (I always try to get those when I'm on the West Coast!) and found them to be nicely prepared and quite delicious.
For breakfast I highly recommend Steakhouse 55 if you want a nice quiet, pleasant meal. We hope to try for a dinner here as well. Prices were typical for disneyland breakfast, about $10 for a plate, we spent $30 for our complete breakfast with coffee and diet coke.