Considering 7:30 is the earliest ADR time you can get, you shouldn't have a wait to be seated and the characters will most likely get to you within the first pass. If you want to make the MGM opening, you should plan on being out of Cape May by 8:30 and walk, not stroll over. It will take about 15 minutes or so from the BC to walk. I'd kind of feel bad rushing through a $20 a person breakfast, but that's just me.