I just did Epcot eve emh last week so I can tell you how it was that particular night. No FP+ during emh.
We skipped Illuminations to go watch Capt. Eo and ride Figment (both no waits). TT was 30 min wait just before Illum. and Soarin was still 45 min which was why we opted to wait.
We got out of the Imagination pavillion around 9:15ish just as Illum was finishing, wait at TT was listed as 20 min so we zipped over there, it might have only been 15, not bad at all. We were going to ride again but it had moved up to 40 min when we came out as people streamed in from Illum. Headed to MS but the orange side was down, not good. That funneled even more people to TT and it ballooned to 50 min. Soarin was around 40 at that point.
We sat on a bench to eat our desserts we had earlier purchased in the candy shop in Germany. Luckily the orange side of MS came back up with 10 min. wait so some went to ride that. By 10:30 TT was still 50 min, but Soarin dropped to 15 min! My group opted to ride Spaceship Earth and shop, no wait at Spaceship Earth. Wait times for the stuff in the Seas was 15 min so not bad.
We thought it was worth while, nice to stroll back through the empty countries on our was to the Dolphin.
I just did Epcot eve emh last week so I can tell you how it was that particular night. No FP+ during emh.
We skipped Illuminations to go watch Capt. Eo and ride Figment (both no waits). TT was 30 min wait just before Illum. and Soarin was still 45 min which was why we opted to wait.
We got out of the Imagination pavillion around 9:15ish just as Illum was finishing, wait at TT was listed as 20 min so we zipped over there, it might have only been 15, not bad at all. We were going to ride again but it had moved up to 40 min when we came out as people streamed in from Illum. Headed to MS but the orange side was down, not good. That funneled even more people to TT and it ballooned to 50 min. Soarin was around 40 at that point.
We sat on a bench to eat our desserts we had earlier purchased in the candy shop in Germany. Luckily the orange side of MS came back up with 10 min. wait so some went to ride that. By 10:30 TT was still 50 min, but Soarin dropped to 15 min! My group opted to ride Spaceship Earth and shop, no wait at Spaceship Earth. Wait times for the stuff in the Seas was 15 min so not bad.
We thought it was worth while, nice to stroll back through the empty countries on our was to the Dolphin.
We were there the 8th through the 14th. We did Epcot EMH and I can vouch for what the above poster is saying. That sounds about right. Though Test track kept getting worse late into EMH. Close to 60 mins when the pack was close to closing.
Funny enough, and I apologize for going a wee bit off subject, MK had the best EMH situation. It was near dead. What a great night to be there. Peter Pan and Pooh had two of the worst times at around 35 mins out of those open for EMH. If you have a chance to do MK EMH on a Sunday night....do it....you won't regret it...

We plan to be at MK until 3 am on June 1. Epcot closes too early and has too few attractions to be a viable evening EMH park.
Firstthere is no FP during EMH (unless WDW has done a major change I am not aware of. I used EMH when at Disney over Easter break for Soarin at EPCOT and PP at MK. A factor during EMH is even if the line is the same length as regular hours it would go faster because nobody had FP. The line for both took us around 40 minutes but keep in mind Easter is one of the busier times at Disney.
Anyone else have any experiences with lines at evening EMH at Epcot ?
Epcot EMH in the evening are almost always worth it if you want to walk around the WS at night and enjoy the atmosphere and do things within the various pavilions. The headliner attractions however are hit or miss. I noticed a change after they cut the hours from 3 to 2 because it was usually in the final hour that the wait times tapered off very quickly. We have had mixed experiences and they don't seem necessarily tied in with the general crowd levels at that particular time. If you go with reasonable expectations and aren't staying specifically for just one or two attractions, then it is not likely to disappoint.