A couple of data points from when I held UA*G status:
In 2011, flying Y PVG-SZX, I checked in at the *G desk, and right after the security check my friend and I received a free golf cart ride to a CA lounge.
Also, for a few CA flights in 2012, check-in staff always gave me a (Y) seat very close to the J cabin, which led me to believe that they think it's a privilege.