We took our double jogger on our 2005 trip. At the time we had DS 15 months (very tiny for his age) and DS4 (Exteremly tall for his age) and it was the only stroller the two would fit in together. I am not a fan of having two strollers for many, many reasons and even though DS4 doesn't use a stroller at home, WDW is a whole other world.
We had no problems with it what-so-ever. I love that stroller. We plan on taking it again for our Dec trip. It was exteremly easy to manuever (and I was 6 months pregnant at the time). We could roll it right onto the fairy and the monorail in the handicap car (as long as no wheelchairs were present). We could even just roll it on to the boat from WL to MK. We didn't have a problem using it on buses--most bus drivers just volunteered to open the handicap door for us. It fit in through all the gates exteremly easily, except MK where it was a tight fit. Through stores it was no different than if we rented--same width.
Now, the details of our stroller: We have a double schwinn with the option of a locked or swivel wheel. The third wheel goes under the foot stand so no chance of hitting anyone with it during those super crowded times. /the seats recline seperatly so if one is awake and the other asleep, no problem, or if you have an infant who doesn;t sit up yet. It has the extra padded seat so spills can just be handled by tossing in the washing machine. There is a 5-point harness belt system. The canopy is large, and there is side coverage. There is a rain cover and a bug/uv shade cover--we used both frequently at WDW. The storage basket was ample and there is a pouch on the back. For WDW we put on insultated stroller cup holders and extra hooks (we rarely used the hooks except to hang popcorn buckets and things like that). The thing folds easy and is easy to carry folded (can do it one handed), but be sure to lock the front wheel first. The thing is super durable too. We seriously abuse that stroller and it still looks brand new.
I'm sure there are thigs I'm forgetting. Just ask if you have any specific questions--you might want to pm me if I don't answer on the board right away, in case I don't get back right away.