I've run into this type of strange reaction as well - like "OMG!!!!! a bike!!!!! what do I do**********"
Another common incident for me is when I'm in the bike lane and there's a distinct right turn lane to the right of the bike lane, and I get cars that wait behind me (despite the fact that there's an entire lane for them to turn). I'll try to give them freindly encouragement to come around, and that typically works.

As far as buzzing, I'd say I encounter this maybe once a month. I changed part of my route by taking a street that is two blocks down from my old route, and the difference is night and day. Both roads were recommended by Google Maps for "bike route" when I mapped it, and I chose the first one due to the presence of a distinct bike lane. However, the road has street parking on both sides (door zone), a narrow bike lane on each side, then 2-way traffic (busy street) all on a pretty narrow street that is posted for 35MPH. This pretty much required cars to pass me within 2 feet on the left, with me in the perpetual door zone on the right.
The new route is an un-marked (for bicycles) quiet residential street (25mph limit) with little to no traffic. It is so much better for my commute. Instead of constantly being on high alert for possible doors, road imperfctions, and buzzing drivers, I am spinning at the same pace amidst pretty 1920's bungalows with trees and birds. I'll take route #2, thank you.
I have encountered similar results in other places I've lived - subtle adjustments to route selection can make a dramatic difference in your own safety and enjoyment.