One of the main reasons we decided to rent a double stroller at the parks rather than take our own was the problem of buses. We willingly traded off carrying our 2 pre-schoolers (if necessary) to the buses at the end of a long day rather than deal with trying to wedge a big folded stroller into a crowded bus, or worse having to wait for the next bus.
I was leaning towards taking our own (it's a sit and stand model), but the boss, um ... I mean my dear dear wife, talked me into renting. As always, she was right (I HATE THAT!!!

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I remember seeing parents on crowded buses dealing with their folded up strollers, and I also remember seeing people lugging their strollers up and down the steps at CBR.
For some people carrying their kids to and from the buses is a pain, and they take their own strollers. For us, we preferred carrying our kids instead. Besides, our 5 year old and 2.5 year old walked to the buses at the resort, and from the buses at the park entrance upon arrival. About the only tims we actually carried them were when they were all tuckered out later in the day. Sure, my little one got a little heavy towards the end, but I found it nice to have her melt into me.
-- Eric
