Just connected in IAD on Sunday and the customs line was insane. It spilled out from the lanes they'd created with the velvet rope things (though of course not velvet rope...I don't know know what those things are called) and into the hallway.

We managed to slip through the crowd and into the poorly-marked Global Entry lane, where there was no line. I don't understand why CBP doesn't staff the customs lanes for the amount of passengers they get. They know how many people are coming and how many flights are scheduled - this shouldn't be rocket science.