One of the funny things about discussion forums is that no matter how impersonal they have to be due to the numbers of people reading them someone will always decide that you are talking directly to them. The problem isn't with the people that have a legitimate need for a stroller, but, like scooters it's the unnecessary usage that creates the bottle necks and the navigational problems. You have a 4 year old and a 9 month old, of course you have a legit need for a stroller and in a way you are doing the crowd a service by not having an easily distracted young person putting themselves in harms way every few minutes. So it makes me wonder why, under those conditions you would even feel a need to respond. It didn't even apply to you or anyone else in your situation. Preteens in a stroller or kids walking and piles of unnecessary packages or things brought from home filling one up is not very thoughtful and is self centered. They may not think that they are causing any problems with traffic flow or space, but, they are and that is more what the upset is about.
It does bewilder me how people with older children cannot seem to move an inch without every single thing they own (yes, I know.. an exaggeration) with them. My first visit to WDW was with my wife, myself and my 6 and 9 year old daughters. No stroller, we walked all day long. I had just my regular pockets in my shorts and my wife had a small purse... my girls carried nothing. We made it though each day with no needs or problems. It made being there so much easier and enjoyable to not have to be pushing things around, finding a place to put them so we could take in a ride or attraction, not worry about covering things up that we didn't want stolen and worrying about whether or not the stroller would still be there when we got back. It was a whole lot less stressful to just think, if I need something that bad, I'll just buy it. But, that is me and doesn't necessarily apply to everyone