I did WDW in July of 08 w/ a Chicco ct0.6, in non fancy talk, a really cool umbrella stroller. We (I mean me) agonized for 3 months over the stroller. It had to be able to carry a 1 1/2 yr old and then possibly a 43lb 3 yr old if she got tired. PLUS fold easy, be light enough, and have a shoulder strap. We rode the buses a lot. It was awesome, dh had no issues using it and carrying a toddler, the diaper bag and the stroller. He really was my pack mule I swear, I was 8 months prego at the time. It's like 6lbs total and ANY shoulder strap from a duffel bag works, I forgot the one that came with it.
It breathed nice, dried quick when dampened by sweat or water, stood out in the crowd (its lime green w/ polka dots) and fit in any area I went in. It will be making it's 2nd trip in Feb 2010 and I'm going to get another 1 for my youngest. I'd never do a double and am glad I didn't then. It would have been way too bulky for most of the stores and even some of the crowds and hard as heck to get on/off the bus' etc.