when we were there last July and again in August we avoided all of the EMHs, morning and evening.
However, when when we were there in September we accidentally arrived at the MK on an EMH evening. I couldn't understand why main street was so crowded for the parade (we'd come specially in time for the night parade and fireworks).
When i realized the crowd was moving into the park rather than out, it dawned on me that we must have hit EMH. But since we were just there for the parade and fireworks i didn't care.
But then, just for the hell of it, while we waited for the fireworks (after the parade was over) we went over and got our wristbands (we always stay onsite).
As soon as the fireworks were over, the park really emptied out and it was heavenly. I love the MK at night when it's completely empty like that. My daughter and I walked onto every ride, no line at all. It was wonderful and we had a fantastic time.