I guess I am also looking at the parked vehicles there too, which has the added danger of being doored, which would also require extra attention from you, which diverts it away from the moving vehicles. You passed three cars before the red car left-hooked you, so no, I suppose it's not congested, but still a long line of cars ahead of the two left-turning vehicles.

Where I ride I do have a short stretch of road similar to yours but without the parked cars. There are various points where cars turn right, including two highway on-ramps, and traffic is normally stop and go during afternoon rush, so I end up passing many cars, like you. I am always hyper-aware of being right-hooked whenever I am approaching an intersection. And not everyone indicates either.

Glad there was no incident. Live and learn.