As soon as I saw the line up I drove to the L2 charger you refer to and checked but there was a Volt plugged in there.
I ended up waiting less than 30 minutes for a Supercharger pedestal to open up, not as long a wait as I anticipated. Everyone was well behaved and the line moved smoothly.
I doubt you will see anywhere near the crowd I experienced. I believe the crowding I saw was due to the unusual combination of: the annual wine festival, multiple big weddings in the area (according to the motel manager I spoke to at the Vino Inn across the street), Sunday summer travel, and the SpaceX launch at Vandenburg a few hours earlier. I was amazed at how many Tesla owners I talked to at this Supercharger who had gone to the launch!