We were there this past week and had a Saturday 8:00 am breakfast at BOG. This was a 9:00 am park opening with EMM taking place as well.
We got done eating about 8:40 and walked out of the restaurant. There was a line forming at the end of the walkway up to the restaurant (to the left of 7DMT if you are facing the ride). At 8:45 they let everyone go to the ride, which was the same time that the regular rope drop crowd was let go at the front of the park. We had to go through the stand-by queue, but were on the ride before the rope drop crowd arrived. By the time we got off the ride, the rope drop crowd was there, but we were able to get one ride in with no wait (other than the few minutes that it took to wind through the queue).
The only difference between that experience and the one we had on Thursday (also an 8:00 am BOG breakfast but no EMM that day) was that on Thursday we were let through the fast pass queue at 8:45 rather than the stand-by queue.
I can't say it will always be this way, but this past week the only difference between the day that had an EMM event and a day with a normal 9:00 am park opening was which queue you had to go through at 8:45 am.