In Belgium we don't have a word for doored either. But we don't use our right hand, we are just learned to look and make sure we are not going to smack someone of their bike.
Also often the lane next to you is a car-lane. As such you also learn not to swing open your door wildly, as you might loose your door ;)
Yeah, this isn't just a thing to protect bicyclists, this is also about how to safely exit your vehicle with a lane of traffic next to you. Can't count the number of people over here (USA) that just blindly throw open their door and hope for the best.
I always check, and if I have to open my door with a line of traffic going by (there's some streets around here where traffic going by is literally endless) I open it a crack first, then open it only as much as I need to exit, and do the whole process slowly, and watch the approaching cars the whole time. I can't remember the last time I've ever seen someone else do that though.
