And so is the case. Hectare is one of the metric mesure. 1 hectare= 100 ares (same as 1 hectoliter is 100 liters). 1 are being a 10 meters by 10 meters square (100 sq. meters), one hectar is 10 000 sq. meters. In outdated complicated not simple units, it makes about two-and-one-half acres.
The horse power for car is anoying, though. Especially given that there are two of them, fiscal horses and power horses.
As for the old francs, I think they will at least disappear. Dividing by 100 is easy, dividing by 6,55957 is not so. The euro will at least get us rid of these people speaking in old francs.