So Sorry....did not mean to offend!
You didn't offend me. Just wanted to point out that sometimes things are what they look like, but not always.
I have had the personal experience of sitting with my DD on a bench when someone walking by said something on the order of "That girl doesn't need a wheelchair. Some people get them to cheat" to his companion. This from seeing my DD sitting on a bench with her legs crossed, swinging her top leg. In actual fact, she can't walk or stand without someone totally supporting her - and she's not even able to cross her leg by herself. Plus, her $6000 plus custom wheelchair was sitting next to her - an obviously custom one, not a rental one. So, I'm a little sensitive about the subject.
Anyway, to the stroller thing. The first time we went to WDW, my oldest DD was 4. We had a stroller for youngest, but never did
rent a stroller for my older DD. By the next time we went DD #2 was almost 3 and had a wheelchair. Oldest DD was just 6 and complained a few times, asking us to take younger DD out of the wheelchair so she could ride. We let her do it a few times, but basically if she was tired, we stopped and rested. This was in the years when we were 9 am to 9 pm tour-ers and we really did quite well without a stroller.
On the subject of bigger kids in strollers, I have seen some pretty tired out looking parents pushing heavy kids in strollers. It's very hard to push them in an umbrella stroller made for a child half their weight (but I have seen people doing that). So, if you have an older child, it's best to rent a stroller at the park. And keep in mind that the child may not get tired becuase they are riding, but the people pushing the stroller will get tired quicker.