Reading some more experiences above reminded me of several more errors in judgment I've made at WDW in the past:
(1) Using Alamo - their horrible, old, off-site rental location was guaranteed to take at least two-hours of your time getting a car.
(2) Fighting the crowds after Spectromagic to get on a monorail, bus or ferry boat. What we've done several times is drive to the Contemporary, park there, visit the arcade and shops for awhile, walk to the MK for the parade/fireworks and then leisurely walk back to the parking lot to return to the Poly or other resort. Likewise, we usually return by car to EPCOT in the evening to see the fireworks show and then enjoy a peaceful walk back to the car for a relatively easy trip back to our resort, while others stampede to get in line for a bus or monorail.
(3) Getting too worried about minor details, like not being able to get a PS for a certain breakfast, or being too picking about which resort building we wanted, or struggling to get the perfect spot to view a parade, or letting the weather spoil things. These things were distractions from what was really important, namely being able to spend some time fun together as a family and create some neat memories to look back on as the years go by. Every time that I get the chance to visit WDW, I try to consider that it might be my last time there, and this has really helped me to enjoy each moment to the fullest and avoid getting bogged down in worrisome details. Even dealing with the occasional long lines or crowds doesn't seem to bother me as much as it once did. Maybe that's one of the benefits of getting older - learning how to have a better perspective in life!
DaveK