Here are some tips!
Start E-night near Frontierland. I think most people hit Tomorrowland first. On Saturday, we hit Jungle Cruise just prior to closing. That ride is different and fun at night. The fireworks were going off overhead. It was great! After that, we headed to Pirates just before closing. After closing, we made our way to BTMRR.
We made our way to Tomorrowland and only had a 5 minute wait for Space Mountain. After riding everything else, we headed back to BTMRR. That part of the park had cleared out. There was virtually no one in line for BTMRR. We picked a car in the middle, since everyone tends to want the back or the front. We got to ride 5 times without exiting, because there was never anyone waiting in line for our car. That was great!
We do Splash Mountain last. We walked right on and were told we could stay in our boat, but once was enough.
Also, keep in mind that the only way to get from Frontierland to Tomorrowland is going around the castle and entering Liberty Square. You can't go to Adventureland or Fantasyland. You can't even go through the castle. If you keep to the route I mentioned, you won't waste time on detours.
Have a fun E-Ride night!