We did this last Wednesday, January 16.
We got to Animal Kingdom at 6 PM so we had to wait around for an hour prior to everyone being gathered.
Something else we learned was that Disney allows people who get on the line even at 7:59 PM to Pandora to finish the ride so we were advised to do Avatar Flight of Passage at 9:30 PM.
At 7:00 PM, an hour before the park closed, we were let in and were advised to take advantage of some of smaller rides. (Rapids and Safari were closed). We did Dinosaur, Primeval Whirl & Tricerotop Spin.
Around 8:15ish we did It's Fun to be a Bug and made our way to Expedition Everest where we got our first Premium Ice Cream bar. Did Everest twice and by then it was about 9:00, we got our "cups of popcorn" and "small cups of soda". We refilled a few times and watched Rivers of Light.
After 9:15 pm, we made our way to Pandora and since we were newbies to both the Navi River Journey and Flight of Passage, we did the Navi ride first because we wanted to save the best for last. Avatar Flight of Passage IS AMAZING and that experience was worth the $125 ticket alone. We finished the night in Pandora, riding the Navi ride twice and the FOP three times.
By 11, we stopped at a different spot and got another Ice Cream bar and we both took bottles of soda and water and a box of popcorn each. (I would check multiple areas giving the complimentary items. As I said earlier, the place near Everest were giving away small cups, the place near Pandora were giving away bottles and boxes)
It's definitely worth it, just for the Avatar ride and the multiple ice cream bars. In the span of 4 hours, we did 6 rides (total of 10 times) and 2 shows. I personally wouldn't do this experience in Magic Kingdom or Epcot at the moment, but would definitely do this at Hollywood Studios when Star Wars opens.
Edit: As an aside, eat before you do this as they won't have any place unless you want to pay for hot dogs or the like prior. Although, I'm not sure if Yak & Yeti, Tiffins, etc. would be open, however, we didn't want to waste our time sitting down to eat at AK, nor did we want to "pay double" if we started the day in AK instead of another park. We ate in Hollywood Studios around 3:30 which made us eager to snack here.