I usually wait til the busy afternoon to ride Mater's Junkyard Jamboree, Monsters Inc, and everything in A Bug's Land as well as some of the Paradise Pier rides like the Silly Symphony Swings, the zephyr, the Little Mermaid ride, and I have also had good luck with the two coasters, Goofy's and CA Screamin (they both have FP, too, so you could pull one while you do the other stuff on the Pier.
In DL, Pooh is usually the shortest line on busy days, followed by Small World and occasionally Buzz Lightyear's Astro Blasters, though now that FP is available for Buzz it's been a longer wait. Buzz is a disconnected FP, though, so it doesn't affect your FP availability times, it's just a bonus one lots of people are pulling as they get their Star Tours FP because it's the same set of machines (like 4 for Star Tours and 2 for Buzz).
Also, watch the app in the park for short waits near you before taking off to another area!
Have fun planning!