We always get fast passes for Soarin' and Screamin' seems to us, those are the longest, but we dont do every ride there either. Usually we do GGR, Soarin', TOT, then the roller coaster.
Get there about 45 minutes before opening. At 30 minutes before opening they will open the gates. Have your race walker go first through the turnstile and then collect all tickets. The race walker goes to Soarin to get an FP and the rest of the group heads toward the line up for Toy Story Mania. It has been posted how it works but basically you will be one of the first ones on Toy Story Mania. then ride again then you can hop over and do Screamin then walk back to do Grizzly Rapids then Soarin. That is how I would do it but probably am wrong.
The only rides that really develop long lines are:
-Toy Story Midway Mania (no FP so go early or be prepared to wait)
-California Screamin (FP)
-Soarin over California (FP)
-(Grizzly River Run if the weather is warm) (FP)
That's really it. Tower of Terror and Mulholland Madness don't usually have long enough lines to warrant FP usage. Other attractions usually have very manageable lines.
So basically, TSMM first. Grab FPs for Screamin and Soarin throughout the day, and do the rest of the park at your leisure.