My first-ever time riding Everest was about a month ago on my first WDW trip in over 14 years. Yes, I had some catching up to do!
I went to the Animal Kingdom on a Wednesday for the extra evening magic hours and it did not dissappoint! I started the evening at Chester and Hester's Primevial Whirl and did a spin through Dinosaur, but closed the night at Everest.
For my first time riding Everest, even in the dark, it was something amazing. I rode it 10 times as I was in the single rider line (I did WDW solo, by the way). The entire time and not a bad seat on the train.
I"m quite impressed on how Disney uses ambient light and only lights up the things they want you to see in the dark. And after riding Everest the next day during the day, it took on a whole different aspect, but it is still quite an impressive (and tall) coaster.
But riding a roller coaster in the dark, regardless if it's Everest or Tower of Terror or Top Thrill Dragster or Millenium Force or Magnum XL 200 or Maverick (the last four are from Cedar Point east of Toledo), you get a whole different feeling. It's pretty sweet.
My 2-cents.