We had an 8:05 at CP last Wednesday, when the park opening was at 9. We arrived at about 7:40 am. They let us, and all the other ADR folks, in at about 7:50. We took some nice photos in front of the castle and then checked into the podium at CP. We were at our table almost exactly at 8:05. I let the server know we were anxious to be out of the restaurant by 8:45. Dh, dds, and I ate quickly, but we certainly got our fill. The characters came by one by one within the first 15 minutes we were there. We were all full and ready to go by 8:35, which surprise dh because he thought I was out of my mind thinking we could be finished and full at a buffet in under an hour.
We left CP and headed through the castle to the rope that guards the entrance to Fantasyland. When the rope dropped we were right there outside of Tink's Treasures for dds to wake her up. Then we quickly footed it over to Dumbo and made it there before most of the people at the turnstyles had made it up to Fantasyland.
This early seating breakfast is now a must-do strategy for us. We loved how efficient it was!