Last week, DW and I went on all the roller coasters at WDW, and the ones we went on more than once were Space Mountain (3 times), BTMRR (2 times), and Expedition Everest (2 times). The one we liked best, by far, was Expedition Everest. It's our favorite coaster of all the ones we've been on at any park, anywhere. It's got the thrills, the speed, the G forces...AND it's got the great Disney theming.
On our last full day, we made a special side trip to AK just to ride EE a second time. It was even better the second time through. I got to really appreciate the three stages. It starts out kind of like BTMRR, then the second stage is faster, backwards, and in the dark. The final stage is where it really gets going, plus you get the little thrill at the end of the ride. What a great attraction!
As for RnRC, we weren't that impressed. Maybe it'd been hyped to us too much, but the only part we really enjoyed was the first couple of seconds when you can feel how quickly it's gaining speed. After that, it was pretty ho-hum as far as modern coasters go. Yeah, it was in the dark, but road signs make for poor theming. Just our opinion.