I actually prefer IAD connections. With sufficient time, I ride over to B and enjoy the nice new terminal with its shopping/dining options and clean, empty bathrooms. All the variety of international flights at B are also interesting.

With even more time, I can always hop to the Air/Space musuem.

On each of my int'l connections arriving into ORD, i've missed my connections due to the time it takes to exit and then ride the train from the int'l arrivals area back to the United terminal to then clear security again.

I also dislike the very long walk underground with the strange neon lights...