Stay away from the Magic Kingdom on Mondays. When you do go to the MK, hit Fantasyland first, then get a FP for Splash Mountain or Space Mountain. Do Stitch during the 3PM parade. Save Haunted Mansion and Pirates for when it’s busy, those lines move quickly.
When in Epcot, grab a FP for Test Track and then do Mission:Space, as single riders if you really have to.
Head to World Showcase, even on the busiest days, that won’t be mobbed.
Never believe the wait time for Tower of Terror, whatever it says, subtract 10 minutes. Get a FP for Rockn Roller Coaster EARLY.
In the AK, go to the Safaris ASAP!!! The animals are active early in the morning, and this ride is packed later on. Even if it’s 20 min wait first thing, just wait, don’t get a FP.