About the only time I use it is at SFO when I am transiting East on an overnight transcon or midcon. I land at SFO about 8:00pm and have to wait three hours or so for the IAD or ORD flights. So not very often. :-)
In the morning, they are either not open, or I can arrive within 60 minutes of departure which, after EasyCheckin and security, means about 5-10 minutes before they start pre-board and I am on the plane.