I have always been amazed on these boards how this issue can be so big for people.
I will be renting a double stroller in Sept for my kids who will be 8 & 6.
Yes, they are healthy. DD7 (will be 8) plays on a travel soccer team with games and practices 4-5 nights/week. DS6 plays tball and soccer. They NEVER use strollers anywhere else but WDW. However, it is very hot in FL in Sept and I want them to enjoy themselves, not be overtired, and be able to have a bit of shade - and gasp! even a place to nap if they choose to while we are at the park.
I am not ashamed and pretty much will say it to anyone who has a problem with it.
This is personal preference - people can (and should, when asked) give their opinions on what they would do and why --- but at the parks people can be so mean and rude to parents with older kids who are in strollers. Giving your opinion on what you would do and why is soooo different than making a judgment on people who choose differently than you do.
Good luck. For us, it's worth it. I rent at the parks so I don't have to carry them on and off the bus - the kids can make the walk from the stroller place to the bus stops and to the rooms (and did so even when they were 3 and 5), but within the parks - we find it helpful.