Extended Evening Hours and Disney After Hours are not the same. I am a DVC Member/ Deluxe guest and was not impressed with Extended Hours at Epcot (the only one I've done). When the park closes it was an hour later before park guests were ushered out. I did not get to ride but a couple of rides. A nice perk to have but not the same as the paid event.
Disney After Hours Party at HS was a blast for the 6 of us, 4 in their 20's. We walked on and rode several rides sometimes more than once. Yes it's pricey but for us worth it since we were there New Years week 2022 and the parks were packed.
At the After Hours event you have to show your arm band, only ticket guest could remain in the park. The park felt empty in comparison to earlier in the day.
Also at the After Hours Party you get unlimited popcorn, ice cream and bottled drinks. Took extra drinks back to the room.
Luckily when I'm at Disney in February there will be an Extended Evening Hours at HS and I've already booked.
Of all the park ticket money I've spent, to me this was the best.
I have not attended the After Party at MK. Would love to but it hasn't been available during my stays.
Hope my post has helped.