Fast pass works like this, you go to the kiosk put your ticket in and it will print out a time to come back. For rides you can only hold one fast pass. There are fastpasses for like WOC, fantasmic, meet and greet and and elsa, they do not require you to wait to get another fast pass, so you can go get a woc fast pass and then go and get radiator fast pass. If a fast pass time for like RS or Indy happens to be much later, say you pull it at 11, but the time to come back is 4, after 2 hours you are allowed to get a second fast pass.i have never had that happen, but then again I don't use fast pass system a lot, I do the parks early morning and late night, skip most of crowds. Plus I hate to walk all the way out of my way get a fast pass and then never use it because I'm busy somewhere else and do t want to walk all the way back, so I only use FP a few times a day, one is soaring, Indy.
As one person said do the parks early and late. I can tell you my stradigy that works for me, I have autism spectrum disorder,high functioning, I hate crowds and get aggravated waiting, and as a child we went a lot and they had no disability cards so I had to learn.
For DL assuming first assume you have MM, do PP, Dumbo, Matterhorn, space, I usually get all this done during MM. Then exactly at opening be in line to go up into adventure land and all the way to splash mountain, ride twice with no line, three times if you want. Then head down to HM, POTC, Indy (if crowded get FP and go do BTM) jungle and then BTM. It is usually 10 to 10:30, I go to too town and hit RR and IASW. By 11 I am done and ready to relax, take a swim a nap or whatever. When I come back in, I watch shows, do tiki room, parades, eat fantasmic second showing. Then I go to space, subs, and Star Wars, if you have to, and autotopia. I usually can get all of that in the last hour. Especially if you can still pull a fast pass for space.
What I have left out I did so mainly because I always seem to be able to find a time in day that the lines for them are 10 minutes or less, it maybe early in day or it may be late during a parade or fireworks, but I always can find a time.
If you don't have MM, than skip the first part, do all the rest, but when you come back in, try to hit like dumbo, PP, mattahorn during parades and such.
Over at DCA, if you have EE do RS first. Then toy story three times. I then do screaming, never a wait that early in morning. I walk to fun wheel and do that. I then continue around the pier, doing everything I want until little mermaid. Then you have a choice, do grizzly, which I usually do because it's time to get wet, about 10:30, and then I can go dry off, eat lunch, swim, nap and come back. When back I grab a FP to soaring and head over to ToT, if to crowded, I do animation, alladin, monsters and go back to soaring, then catch a ticket to TOT. Then hit bugs life. Woc.
Tip for parade, since bf is in w/c, I don't really have one for DL because we sit in w/c place. But we use to sit in front of the bathrooms going up to Alice, that was a nice spot. For DCA, we sit where the chickens sit who won't go on ToT. Front line and there is usually sits there to sit in. You get to see them as they come out onto the street, usually lots of hellos and how you doing, but not always the dancing, although you do see some.