EPCOT= SOARIN
MGM= Rock n Roller Coaster
MK= Space Mountain or Splash Mountain
AK= Expedition Everest
I go frequently and I've only ridden Soarin in the Stand-by line 3 or 4 times, whenever you can get a FP for Soarin get one since the regular line can get to 90 minutes often.Stand-by line for Test Track and M:S isn't usually over 40 minutes, even though I saw TT's at 60 my last visit, plus those two have singles line to give you another option.
Over at MGM RnRC's line always seems to move slower than Tower of Terror, plus a lot of the line is one of those that go back and forth and gets really annoying if it's not moving.Tower's stand-by line is really nicely themed and makes it more tolerable, plus it is a faster line.
At AK, there's no questions Everest is the new ride and the line will be at 60 minutes or more by 11 am, Dinosaur's line in my experience is always quick and Kali could be pretty long especially if it's hot. The safari ride could also get long so you could get a second fastpass to Kali or KS, but first go with Everest.
At Magic Kingdom Splash and Space mountain are rides that could definitely get long at times, on my last visit they were both around 60 minutes due to spring break and there could be times that the longest they get is 20 minutes, so get one for Space first and then for Splash later in the day.Haunted Mansion, Pirates are rarely long waits, Philharmagic is a 3-d show that holds like 200 or more people and Fastpass migh not help you much.Another ride to consider getting one is at Big thunder, even though it's rarely at 60 minutes unless it's a peak period.