If you're going to do rope drop in order to experience short lines, I would not plan to eat breakfast in the park or you'll lose your entire time advantage of rope drop. Unless you intend to arrive well in advance to give yourself time to make it to (and deal with the pre-rope drop crowds at) Casey's or the Bakery and eat on Main Street in the hour before the park officially opens, I would plan in advance to eat before leaving for MK--cereal in your room/muffins from a grab and go/McDonald's if you're off-site, that kind of a thing. Breakfast in the park always sounds like a magical idea, but it's hard to combine with actually riding anything with a short wait unless you have a Pre Park Opening ADR.