I know the inside isn't affected by the nighttime, but I really love going on Haunted Mansion and Pirates at night. It really helps sell the idea that everything is really happening. I like how the exterior matches the nighttime scenes in the ride.
I agree. Plus, your eyes are already adjusted to the dark so you can see everything better.
By sheer dumb luck I rode Thunder Mountain during the fireworks show one night. That was incredible... every time we hit the outdoor sections there were fireworks exploding. By far the best night ride experience I've had. I also like:
The teacups. It's so beautifully lit at night.
The lagoon area behind Thunder Mountain and just below the Ranch, the one with the leftover tunnel from the old Mine Train ride. Nice place to relax in the evening.
Now that I think about it, I really just enjoy strolling through the different lands because they're all so wonderfully lit. Especially New Orleans Square, Frontierland and Adventureland.
If you could time warp back to the early 80s, Tomorrowland was AWESOME at night. So much energy and motion from the Rocket Jets, PeopleMover and cheesy 80s cover bands.
Splash and GRR are awesome at night. You don't even need to get out of the ride vehicles, they'll just send out around again.
BTMRR during the fireworks is also stupendous.
I don't think they let you do that on GRR anymore, sadly. Last time we were there, they made us: get out, go back up the stairs, around the queue, hop back on the boat, buckle up quickly, etc. each time we wanted to ride. Plus, the loading CM was, how shall we say this..., not too friendly when my mom couldn't find her belt buckle quickly enough and so they had to halt the other empty rafts. That got old really fast so we only able to ride it twice before calling it quits.
There was no one in line either when we were going on GRR. And we were virtually the only ones on the ride. But that's for another story...
I do agree, though, that those rides are amazing at night!