WE have stayed at the YC, but we only ever do TS breakfasts, so I can't really give a ton of info. I can tell you that in the lobby of the YC there is a bar and in the AM I saw pasteries and coffe and things like that being served there. You can walk over to the BC side and they have the BC Marketplace that serves quick service items. I know they have a good yogurt station. Also, you can walk about 5 minutes over to the Boardwalk and there they have the Boardwalk Bakery.
One thing to consider is breakfast at Captains Grille. It is a TS restaurant with a non-character buffet and an ala carte menu for breakfast. It is easy to get into to and the food is really very good. They make huge pancakes-blueberry or chocolate chip that my kids just love. It is very reasonably priced and we have always been in and out of there very quickly. I believe they start serving at 7:30 AM.