The really weird thing is that we use the inch and foot for certain things as well, although not really as a measurement but more as an "indication".
Everybody (in transport) knows what a 20' and a 40' container is. Never mentioned in metric.
Wheels of cars and bikes are still inches too.
Even worse: TV diagonals always used to be in cm. here, and mostly they still are. However for computer monitors, everybody used and uses inches from the very start of computing....weird !

But now, you start seeing inch sizes on TV advertisements !!!
But we're drifting off...anyway, I knew about the "switch to metric" in Canada because I recently saw a TV program about the
Gimli Glider. One of the causes of this near catastrophe was errors made in fueling the plane because of the switch to metric...amazing story by the way !