I've been flying out of IAD a lot lately, given that the airport road makes it the easiest airport to Montgomery (especially in peak traffice when the GW Parkway is a mess). Mostly, it's to destinations also served non-stop from DCA.

BUT, I fly CO. I've never waited more than 5 min in a security line, and the walk to B isn't short but it isn't that bad either. I can get from curb to B31 for my flights in 20 min tops... with a stop at Starbucks.

The few times I have flown UA... especially out of G... it was like an entirely different airport. Aside from the fact that I've never had a UA flight out of IAD depart or arrive on time, the haul to C/D/G and then the madhouse (especially in G!) makes it worth the breaklights to DCA and the possible connection!!