Am I abnormal in using my door/wing mirrors before making a turn or using roundabouts? Serious question.
It's something I was taught long ago and reinforced when I took my bike test where they called it a 'life-saver' when you check over your shoulder. In the case of a motorcyclist it's most likely their own life they are saving; land rover, someone else's.
If you are abnormal, then so am I.
I never, ever, move my car into a position that I haven't checked with my eyes (directly or via mirrors) to be clear.