I agree. We've only used EMH once at Magic Kingdom when we were staying at BLT--it was fantastic! We'd spent the earlier part of the day at some other park, and just went to Magic Kingdom a half hour before EMH was starting. It was great being able to just walk back to the hotel at the end of the night.
I guess it depends on when you are planning to get to the park. We normally try to get to the early EMH park. You can get so much more done in the first 2 hours and then we either head to another park to use our scheduled FP choices or head back to the resort for lunch and pool time. We have not found much benefit in the evening EMH as the park seemed to be very busy still. We did not stay until closing and I am sure that it is much better at the very end of the night.