Ok, I have a few minutes! We did DAH back in May 2016 I believe it was, while we were staying at the YC. It was from 11 PM - 2 AM at that time. We had 2 boys, ages 3 and 6, so when I first heard about it I thought it sounded amazing but figured we couldn't do it given the ages our our kids. However, to my surprise, when I mentioned it to my DH he immediately thought we should do it. I'm the bigger disney fan between the 2 of us, but he is very into paying for exclusivity and no waits, so he thought it sounded great. We actually chanced it and didn't buy tickets until we arrived, because we were upgrading out UCT tickets to APs and wanted to get the rather substantial AP discount. So they day we arrived we walked into Epcot, upgraded our tickets to APs, and bought the DAH tickets. It sounds like that wouldn't work now, as people have caught on to how amazing it is and they are selling out. Back then there were reports of people being given tickets at their resorts, etc. I'm pretty sure our night didn't sell out.
The day of it we made the kids (and us!) take a nap in the room for 2 hours with the blinds drawn, etc They resisted, but it worked and they were able to make it for the event. We went over to the MK in early evening, probably around 7. Interesting fact - we actually ran into Pete on the ferry from the TTC to the MK and said hi. He went that night as well! I was an idiot and said something dumb instead of suave when I was talking to him - it never goes like the scenario in my head

. Anyway, we got our lanyard on the way in and I don't really remember what we did specifically up until the event started.
Once 11:00 hit it was amazing! It wasn't quite as empty as the previous reviews had made it sound, but it was definitely sparse. There may have been a few times that there was literally no other person in site, mostly there were just a few people around when you stopped to look. We started in Tomorrowland, my 3 yr old loved Astro Orbiter (which is always so slow to load) and he and I rode it 5 times without getting off. The 5th time it was full, some of the others there were only a few others on it. Another ride I specifically remember is barnstormer, we rode 5 times in a row without getting off and only got off because I didn't want to waste the whole night on small rides. We rode everything we wanted to ride, the only one we didn't hit that I wish we had was Splash Mountain and we could have done that at the very end but my DH just didn't want to do it, he was ready to head back. We never waited more than the next ride on anything. IIRC other than Splash the only rides/attractions we skipped were Country Bears, Philharmagic, treehouse, Tiki room, and meet and greets. We wanted rides more than shows - and we didn't want the kids to sit down and get tired! We did many things more than once. We also had to trade off on the 44" rides, but not a problem without lines. we stopped for ice cream twice, i would have loved to get more for our money but I can only eat so much ice cream (or can mentally only handle so many calories in the middle of the night

) and honestly, with the young kids, it takes too long for them to eat those Mickey Bars and we wanted to ride! I also "made" us get one picture, up by the statue of Walt in the Hub. That probably took 20 min - there was a little wait for that. But I'm so glad we did it, it was at like 1 AM and we were holding a sign that said DAH. It turned out to be some great family pictures.
We didn't ride right up until 2 AM, we were back in Frontierland and just took our time leaving so we were probably getting on the bus at right about 2 AM. I would have stayed and ridden 1-2 more things, but my DH isn't into getting every last minute out of things and was ready to go. The youngest was half asleep by then also. But they both made it. In fact, the 6 year old was awake when we got to the resort, and the 3 yr old woke up again some also. They were troopers. We slept in somewhat the next AM, but it didn't cause any problems with their schedules.
We loved it, and my DH and I agree it's the best thing we've ever done at Disney. We tend to do a lot of upcharge things, like Dessert Parties, EMM at MK and DHS, Fireworks cruises, parsailing, CL extra FPs, etc, and this was the most fun and worth every penny. No waits at all (I really think we never waited more than maybe 2 min at BTMRR and the line never stopped, it was just walking down and being told which stall), and some "free" ice cream

.
Our next trip was August of that same year, and since they didn't offer DAH then we tried to "recreate" it by doing the 10-12 AM EMH at the MK. We had the kids nap, etc, and had no problem making it until MN. However, I remember my DS3 wanted to ride Astro Orbiter again, and this time it look maybe 20-25 min of the 2 hrs to do it during EMH, instead of riding 5 times without getting off during DAH. In that time my DH and DS6 rode Space Mountain, and they were only able to ride once. It was much better crowds than the middle of the day, but there were still 20-30 min lines for headliners or slow loaders until maybe 11:30. We were only able to ride a handful or rides in the 2 hours. It was barely comparable to DAH. Still fun, and less lines than daytime or obviously a busy day, but nothing at all like the feel of DAH. DAH just felt special, like you were at something exclusive and had the park to yourself, EMH felt like an evening at the MK. Not a bad thing, but very different feel.
I would't compare DAH to MNSSHP or
MVMCP. Those are fun for the holiday feel and special parade, fireworks, etc. The ride lines are pretty short, but we never had time to ride that much if we also wanted to trick or treat, watch the parade, and watch the fireworks. I guess you could buy a ticket with the intent of just riding with short lines, and not doing any of the holiday events, we've just never done that. we don't do every holiday thing - we don't watch the shows, for example, but we still didn't have tons of time to ride. With older kids you might find you have time to watch the parade and fireworks, trick or treat (or get snacks for MVMCP) and still have a decent amt of time for rides, I'm not sure. But I would expect lines more toward EMH lines, not DAH lines.
Hope that helped, wasn't TMI, and wasn't just boring. It made me nostalgic thinking abut it, and excited for our upcoming trip. I REALLY wish DAH was offered earlier in June this year, I would have done it in a second! I guess it was also a long Off topic post for this thread

. We were staying CL at the YC when we did it in 2016, does that bring it on topic

?