bechasher,
We had an 8:40 ADR last week when the MK opened at 9:00 AM
There is a special breakfast entrance on the very far right side of the entrance area, There are CM's there who will help direct you. The Entrance Area was packed with people waiting to get in, but we had no problem finding the right entrance and entering ahead of the crowds.
It was very cool to be walking down Main Street with no one else there. I got some great pictures.
I would definitely get there early and go to the breakfast entrance on the far right. You should be able to enter and walk to the CP before the gates open
Have a Great Trip