I've read about this supposed "solution" and the greatest thing I took away was that it trades side-of-car blind spots (which I can resolve by turning my head) for rear-of-car blind spots, which I can do nothing about, as my head doesn't rotate 180º.
You can't see behind your car using your wing mirrors, you need to use the rear-view mirror. Even if you have the wing mirrors pointing behind your car, the sides of the car obscure your view.
I like to adjust the wing mirrors so that a tiny sliver of the car is visible in the mirror, that way I can be sure I'm not missing anything.
What you do is "normal". The suggestion from the comment I replied to is referring to the "new" way referenced on the linked page, where the mirrors are set wider.
How so? The only possible issue I can see about that solution is that you can't see your own car in the side mirrors and thus judging relative position is slightly more difficult.
Of course, the best solution is aspherical mirrors, but for some reason they're not allowed in the USA.
The diagram in that article underestimates the viewing angle of the various mirrors in the car--my rear view mirror has far more than 90 degrees FOV, and when my side view mirrors are adjusted the "new" way I am just barely unable to see the side of my car.
