I know this was mentioned briefly by a previous poster (PP), but you really should utilize the single rider line. It's a great way to get 2nd or 3rd rides on attractions with almost no wait time. Here's how we do it...
We get fastpasses for, as an example, Expedition Everest, one FP per park ticket. We'll go right away to the single rider line and ride the attraction. SRL is FAST; the most we've ever had to wait is about 5 minutes. (Even in August, when all headliner attractions had regular standby line wait times of 90-120 minutes, the SRL was only about 20 mins, and boy were we annoyed that it took that long!) The cast members use the SRL to fill in "empty spaces" in the attraction seating; you'll be invited to share a ride vehicle with folks who are seated by themselves, or have an empty seat in a multi-person ride vehicle. We ride via SRL, then use the FP to ride together when the window opens- although sometimes we don't waste our FPs (you can only have one at a time, or one every 2 hours if the park is really busy) and just utilize the SRL over and over.
OK, you aren't sitting with your sweetie, but you still have that FP so you can experience the ride together at some point, without having to waste time in line or waste money on extra park passes. OR you could get the FP for EE, then go do something else... either wait in line at Kali River Rapids (which also has FP but you can only get ONE at a time and theoretically you are holding one for EE) or see the bird show, explore the Maharajah Trek, etc. until your FP window opens. Ride EE for the 1st time with your sweetie, using your FP to minimize wait time, then go right to the SRL to ride again. Either way, you will save the money you'd spend on a second park ticket and probably get your second ride in quicker (SRL is almost always faster than even the FP line).
I am trying to remember where SRLs exist... I know they have them at Expedition Everest, Test Trak, I think at Dinosaur... not sure where else. SOmeone will know- that's what I love about the DIS!!