At the beginning of October, we went to Epcot's EMH evening after we closed the MK. Since we were staying at the BC and did NOT enjoy the buses with my ECV, we figured we'd just hop the monorail over to Epcot, walk on through mostly, and head back to the hotel. What a foolish idea that would have been!
When we got to Epcot, most of the people were heading OUT while we were heading in. Things looked very beautiful at night and since so much was open, we decided to stay & do some touring at Future World. I don't remember all of what we did, though I am certain we did Soarin' (& enjoyed it, but we did enjoy it more the next time we rode it, since that night we were in Row 3, but the next time we were in row 1), Journey into Imagination with Figment, Living with the Land, and especially the Character Connection. CC was the BEST, since we were the only people in there, and the character interaction was GREAT. My wife (her first trip to Disney) had a chance to spend some QUALITY time with Pluto, Chip & Dale, Goofy, and especially Mickey. It was WONDERFUL and if EMH evening was not busy again (we went the first week of October), we'd DEFINITELY do it again in a heartbeat!
Think it all depends on (1) time of year, (2) crowd level, & (3) your expectations. For us, when things are aligned right, its DEFINITELY worth it!
Enjoy the Magic!