I am going in a couple weeks and have decided to take the double w/ the carseat carrier. I too am worried it's a bit HUGE, but it does fold and I have seen other families w/ doubles. I can let you know how it goes. I went a couple years back w/ a single fold up and we loved it. Wished we had it before kids. We dumped all of our bags on it and were able to roll it onto the monorail, but not the boats. They were strict about not leaving the baby in the stroller and rolling him onto the boats for fear of it falling into the water and the baby sinking w/ the stroller. We folded it up for the buses... I held the baby, my DH carried the stroller. This time may be tricky because we have 2 little ones now. I guess I will hold one's hand, carry the other, and my DH will still carry the BIG stroller. But at least we'll have it for the long walks back to the resort.