So fun! I LOVED EMM at MK. I’m chronically early when it comes to Disney parks. When we did EMM at MK we arrived at the TTC about 6:45 and had to wait until 7 for security to open and the monorail to start running. When we arrived at the MK there were already people there. I assume they had done the Contemporary walk. If it’s important to you to get castle pics without people in the background I would say you should be one of the first in line at MK, which means arrive around 7-7:15. If those empty street pics aren’t a priority you could arrive at about 7:30 and be just fine.
When we did the EMM at HS they let us in early. Breakfast was supposed to start at 7, and then they said they wouldn’t lead us to TSL until 7:30. We were done with breakfast and lined up to go to TSL at about 7:20, and some of our party was talking about finding a bathroom while we waited. And then they started walking us back! It was awesome!
At MK, however, they held us just before the train overpass until 7:45. It was super frustrating because I thought we would actually be riding rides at 7:45, but with being held so long, and the walk all the way to Fantasyland, I don’t think we hit 7DMT until about 7:55. Ugh.
So, considering both experiences I would still probably arrive at MK early, hoping they would have changed their policy and let us in earlier. Like I said…chronically early at Disney.