We had an 8:05 a.m. ADR at Garden Grill last Monday. They let us into the park at 7:45 a.m.
Our waiter told us that he would bring our food out right away because Soarin would open at 8:45 a.m. for the diners to ride early. We got to ride Soarin with a small group of people before the park opened. It was awesome!