1. Rope Drop. Getting to a park 30 minutes or more before opening gets you a good place in the rope drop crowd. In terms of attractions per hour, the first two hours in the morning can not be beat (EMH excluded, of course). Crowds are low and FP return times are quick, allowing you to get more FPes in a shorter amount of time.
2. Abuse the Fast Pass system. This is tied into #'s 1, 3 and 4. Disney allows you to use "expired" fast passes. In other words, as long as you arrive after the start of your scheduled FP window you will be allowed in, regardless of how long ago the window actually was. So save your fast passes for when you really need them, see other attractions in the meantime, and do your best to get another FP as soon as you are able.
3. Know which attractions always have a short wait time. At each park, there are certain attractions that have a short wait time 90% of the time. Obviously if you're there at super peak times (Christmas, New Year's, Easter, 4th of July, or any other time when park closings threaten) lines will be long at everything no matter what, but otherwise certain attractions will always have a relatively short wait time. These can be saved for midday when crowds are the worst. IMO the are:
MK: Stitch, Monsters inc., TTA/Peoplemover, Carousel of Progress, Mickey's Philharmonic, Hall of Presidents, Country Bear Jamboree, and the Tiki Room (closed now, but I doubt it will draw significantly more people when it reopens).
Epcot: The Seas, Figment, Captain Eo, Living with the Land (30 min, tops), Universe of Energy, any of the films in World Showcase.
HS: Backlot Tour, Muppet-Vision 3D, Magic of Disney Animation, and the Beauty and the Beast show.
AK: Bug's Life, Flights of Wonder, the walking trails, and the Discovery Island habitats.
4. Know the ebb and flow of crowds. Some attractions have low crowds at certain times of the day and short lines at others (ignoring the pre-noon hours when everything is low).
MK: Pirates and Jungle Cruise: low crowds before lunch and after dinner. Save these for one of those times.
Epcot: Spaceship Earth and Maelstrom. Spaceship Earth is busiese in the afternoons. I'd suggest saving it for later when most guests have entered the park and have already done it. Maelstrom has one of the most under-utilized fast pass machines in the parks, so either do it early/late, or just get a fastpass and spend 40 minutes enjoying the rest of World Showcase.
HS: The Great Movie Ride (and maybe Star Tours). TGMG is like Spaceship Earth: everyone wants to do it when they enter the park, no one wants to do it later. Do the big 3 early, then save this for when you're waiting for your fastpasses. Star Tours right now is up in the air. So far the only data we have is for the Star Wars Weekend crowd, who normally artificially increase the wait time for this attraction anyway. It will take a while before the effects of the refurb are seen, but historically the attraction has been open in the mornings and nights and busy in the afternoons.
AK: The dearth of attractions here generally gives everything a long line, but there are a few tips. Flights of Wonder usually fills up late, and the fast pass machines at Dinosaur and the Safari and under-utilized, so the make good use of fastpasses for those attractions.