Breakfast in the
Disneyland Hotel has a wide selection of continental and hot foods (veal sausages, bacon, scrambled eggs, pancakes, tomatoes etc) There is also a good selection of fruit (something you don't see often at disneyland

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There is only one queue and its the luck of the draw where your waitress takes you whether you go to california grill or inventions. It depends where they have empty tables. The food is exactly the same regardless which one you get.
You don't have to book a time. But one thing we found good was to go into the park for EMH and then as its so close go back to the hotel for breakfast later. This then meant you were having a sort of brunch and weren't so hungry till tea time.