It can take a bit per car to get through. The worst day last week had me waiting about 5 minutes to get to the front of the pack. Some days, though, there is no traffic there. It all depends on if the main route is overloaded - when it isn't that intersection is pretty clear.
So far no car has given me any grief over being in line, but I also don't think people are used to seeing cyclists around here.
I won't be able to try again until Thursday due to some traveling for work, but I definitely will report back.