Our boys love in-room breakfast! They don't want to waste a minute of early morning time at the parks, so even our biggest breakfast-eater votes for in-room breakfast. I made an ADR for Cape May (we usually stay at BC) for just one of six mornings, and the first question was: "Will this make us miss rope drop?" (The answer is no - we're going to DHS that morning for a 9am opening and our ADR is at 7:30am - but they still think we're cutting it very close!) Now, we do have a fridge, but we only use it for milk - and as a previous poster mentioned, you can grab that in the morning at the food court, if necessary.
So we bring/buy the following (and this is just for vacation treats!): donut holes, pop tarts, single serve applesauce cups, bananas, juice boxes, single serve cereals (our boys usually eat this without the milk, even though we have it in the room) muffins/pastry purchased the night before at EPCOT or the resort, and cereal bars. Wow - that does not sound good, but 1) there is mention of fruit in there; and 2) it's a vacation and we have a big early lunch at 11:15 or so. I just grab coffee in my refill mug, and we're set!