I kept to the left only because I had been informed of it on the forum here. However, I did see staff directing people to the correct queue as and when they arrived.
Having arrived by car driven by my daughter we initially went to the front entrance and as I exited the vehicle a "Valet" approached me and asked if I was there for a vaccine. When I confirmed that he very politely advised me to go to the entrance further down, opened the car door for me, and when I was back in closed the door gently so no complaints from me there.
Maybe I arrived when there was a different shift on from when you had your experience. I don't know. And as I am pretty much a pacifist I really don't want to start a war of words about this and can only say that we obviously had different experiences so lets shake hands, raise a glass, and have a nice day. Cheers!