I will admit that I don't always understand stroller culture these days. In my family kids were out of strollers by the time they were 1 or 2, they were expected to walk on their own two feet, and they were picked up in crowds.
Having said that, I fully respect that many guests need to use them. I am NOT going to judge how you transport your child. Maybe your kid has special needs. Maybe they just get really tired. Maybe you're worried about walking too much. Maybe you're worried about losing them in a crowd. Maybe in your family kids just ride in strollers for more years than mine did, and that's all fine.
And it's been pointed out numerous times that especially with older children with illness and special needs, a stroller is perhaps much less conspicuous than a wheelchair. If you see an 8 year old in a stroller they might be there because they just had chemo yesterday and they are tired. You don't know.
I think the key is that stroller users - like every other guest - need to be respectful of those around them. If you're wheeling a stroller (or any other large object - ECV, wheelchair, ODV cart) around the park, that means you have an obligation to be careful and not hit anyone with it.