None of my regular commute routes put me that close to door zones, but I still think about it. But last spring I had a slow uphill climb on a wide side street alongside a church. A car was stopped in the traffic lane on the other side of the road, and a car coming up behind it moved towards the center of the street. I could see in my mirror a car coming up behind me, so I veered closer than I usually do to the cars parked on my side of the street. Since this was a long, slow uphill climb at maybe walking speed (3-4mph), I had a least a minute to view the parked cars I would be passing in the next block, and nobody had pulled in or entered any of the vehicles. IAll of a sudden a van's driver door swung open. Luckily I swerved and missed, but the woman who opened it screamed, "Oh my God, I'm sorry, I'm sorry!". I circled around and let her know I was okay. She was very upset that she had not checked her mirror. She had been sitting in the car on the phone, because she won't talk while she's driving. Since the car had been off, she didn't think to check the mirror. I was a little shaken since I had considered the dooring threat non-existent after more than a minute. Lesson learned.
On a similar note: Last month for variety, I let Google navigation choose my route home. It picked streets with bike lanes. The streets were main arteries with more traffic and more door zones than I am used to. Didn't like it.