we have 2 kids, DD was 13 months when we went and DS just turned 5. (this was in May).
We brought our stroller, but on our epcot day we rented a stroller for DS since it was hot and lots of walking.
The baby, though, LOVED the Disney stroller. I'm not sure it would have been great for the whole trip, but she absolutely loved it and crawled into it whenever she could.
I was surprised because it is hard plastic, but both kids seemed to love it.
It was just the right size for her, and oddly just the right size for DS as well.
And, it was super easy to push.