Definitely put down the TTA (Tomorrowland Transit Authority) as a "must do". It is so awesome looking out during the nice, peaceful, slow moving ride at all of the lights and activities.
I was thinking, just today, that I am sad that during our upcoming October trip, there is no time to go to the MK after dark. We are on the (not free!) Dining Plan and have TS ADR's or F & W fest "Noshing" planned for each night. I so love to see the MK at night.
Just another reason to plan another trip in the future. SHHHHH Don't tell me DH
All of the outdoor rides are excellent at night. Especially BTM and the outdoor areas of Splash are even more interesting. Jungle Cruise is actually more realistic at night as well.
We did the EMH on Sept. 14 this year and it was a ZOO! I didn't notice if the FastPass was working but all the rides in Tomorrowland had at least 30min. waits.