I was also at MK on Wednesday, April 6th for Extra Evening Hours and it was disappointing. Why?
1) No fastpasses were being offered...although at about 10:30 we saw that Peter Pan had fastpasses.
2) Lines for Space, Splash, Big Thunder, Pooh, Peter Pan, Buzz, and Stitch were as long or longer than earlier in the day.
3) We were not asked to show our resort ID to get a wristband.
4) Walkways were crowded with guests with and without wristbands. Lines got clogged by guests trying to get on rides without wristbands.
We stayed until about 11:30 after riding Buzz, Philarmagic, HM, and Stitch (after Wishes). We made a loop of the park from Tomorrowland, Fantasyland, Frontierland, and Adventureland before and after Wishes and if anything it was more crowded after Wishes until about 11.
We won't be using evening EMH at MK again. We had much better luck when the park was open until midnight on Thurday, March 31st in the hours from 10pm until midnight than during EMH. We had a great time anyway and loved seeing Wishes again. Mickey's Philarmagic is also a must-do. Anybody else see the hidden mickey? My DS7 saw it first.