Depending on when you're going, what time you're eating and how many are in your party, you *might* be able to get a table at any one of those restaurants without a reservation, but I wouldn't chance it. If you're okay with eating counter service if there's no availability and you don't want to be tied down to a ressie, then you'll be fine without it. But if you really want a sit down meal and don't want to have to leave the park to search one out, then make the reservation.