On our last trip, we decided to try the tip people had suggested for Nemo, and ride it right before closing for a shorter line. I was worried that the outside part of the ride wouldn't look very good at night, but I think I actually liked it better. The colors are more vivid during the day, but it is really cool how they light it up at night, and I think I noticed some things that I had overlooked before.
I also love BTMRR and the Matterhorn at night! So fun!