For what it's worth, we just had that really work out great for us. We got in line with the reservation people and were let into the park about 15 minutes ahead of the crowd. Instead of heading straight to our BOG reservation, we stalled and took photos on Mainstreet on our way in. There are cast members all over to keep you from getting in line, but, they let us wait outside of 7DMT. As soon as the crowds were approaching, they let us enter the line. So, we were the first group to ride the 7DMT and still made it to our 8:10 BOG reservation in time.
That wasn't our plan when we made the reservation, but, it worked great for us and lines were still short when we were finished eating a half hour later. We didn't even realize till we were waiting at the gate that the opening time had changed. So, we were scrambling to figure out what to do.