We had breakfast there at 10:35 in June. It was great, and we weren't rushed at all. No problem getting all the breakfast food we wanted.
Park opened at 8, so we rode non-stop for over two hours with little to no lines, then had an amazing breakfast that kept us full to dinner and then used our FPs to beat the crowds through midday. Headed back the resort around 2 feeling like we'd done a ton of stuff!