I think it depends on when you go, but I have never found any of the food places at BB to be jammed. Keep in mind you will not get anything approaching "cuisine" there - its your basic hambuger and fries stands. There are also stands serving ice cream and other fun items such as funnel cakes. I would recommend setting up camp for the day in a chair near the Lottawatta Lodge - its the only place to eat with tables and some shade, so its as good as any.
We usually eat breakfast before going, and then just snack a bit while there and leave in the mid afternoon, so avoiding eating an actual meal at BB.