I couldnt resist one more tip:
My most important tip will probably be the most controversial. If your kid is up to it, do not bring or
rent a stroller (for a 3+ year old). They are cumbersome, waste time, and are usually empty because the kids are walking around. Bring a small backpack with snacks and juice boxes or Capri Suns and you'll have it made. You can restock your backpack when you return to your room during your mid-day break. I pity the folks trying to fight the crowds to get to the stroller rental when the rope drops. It would also be a nightmare to have a stroller after Wishes/Fantasmic/Illuminations.
We've never rented a stroller, and we've been fine. At 3 yrs. old, my son was wide open all day when we went when the park closed at 6 PM. We even walked around the park for about an hour after they stopped running the rides. He was so excited, he was not showing any fatigue.
My DS is 4.5 years old now and during our trip in July the parks stayed open until 10 PM, and he still did fine. It actually worked out better because all that walking in the morning wore him out enough to take a mid-day nap. (He usually never takes naps) My wife and I are pretty fit, so at times when a mad dash is required I just scooped him up in my arms. I also carried my sleeping angel from a post lunch Country Bears to the boat dock. After a relaxing rest at the WL, we returned and stayed to the very end of the e-ride night.
We were on the very first ride of Dumbo that day, and the very last showing of Mickey's Philharmagic that night that started at 1 AM and got out about 1:25 AM. There is nothing we wanted to do that we didnt do. (I think the only attractions we skipped were the Timekeeper & HofP) Most of the biggies we did at least twice, and we did Splash Mountain, Buzz, Pooh, and Peter Pan four times each. We would never have been able to accomplish near that much if we were toting around a stroller. We never felt like we were rushing and we took time to take in the evening parade and Wishes. On the boat ride back to the WL, my son told me that it was the best day of his life and I was the best Daddy in the world. That paid for the trip right there. We just didnt plan anything the next day except for checking out.
In summation, if you have an active kid and you are staying on property, dont waste your time and effort with a stroller. Youll get more done, with less stress and inconvenience.