There's a blog today about the line at SFO last week (also with photos). I've never seen lines like this.
Passengers were clearly agitated, with some on the phone trying to reschedule their connecting flights and others simply taking pictures.
Of course, ground staff were barking orders at them and being generally unhelpful.
As it turned out, this was the line for foreign visitors. The line for U.S. Citizens was much shorter (Global Entry kiosks were totally empty).
https://liveandletsfly.boardingarea....gration-lines/