... IMO, you can't beat a Maclaren for maneuverability and light weight, but their doubles start at over well $200, nearly $400 for the really spiffy models. However, I did see a deal this am that might interest you, if you want something a little larger than the Kolcraft, but don't want to spend a whole lot. BABYSUPERMALL.COM has a special on the Kidco Maverick double, for $139 + shipping, it's a limited-supply special.
http://www.babysupermall.com/main/products/kdc/kdc14201.html
Kidco used to be the US Maclaren distributor, but they were outbid on it by Bertini a couple of years ago. They missed the revenue, so they hired a mfr. to make Maclaren knockoffs for them. They are somewhat heavier than Maclarens, because they have some steel components, and they don't steer quite as effortlessly, but they are pretty nice for the price, and will accomodate both taller children and taller parents than the Kolcraft (which is fine for what it is, but it sounds like you want something to use all the time, not just at WDW; you may want to spend a little more.) This model has a full hood, padded, framed seats, 5-position recline, telescoping handles, and 2 baskets. It opens 29 inches wide, so it will fit anywhere a wheelchair will.
Good luck w/ whatever you end up getting!