Hey! It's not JUST Europeans...your 'neighbours to the north' also use the metric system.
And after 20 years of using metric, I have never once used decimetres for ANYTHING, not even scientific calculations. Everything is measured in either mm (if really tiny), cm, or m. Occasionally, in science we use um (micrometres), but that's another story.
So, to answer the question, no.
And a question for YOU! Don't you guys find it difficult to convert stuff...like 12 inches per foot, etc. In metirc, everything is in 10s or 100s. It's so much easier.
And when you're in school, did you guys have to learn how to convert between metric and imperial? I know we did a bit...And all the science kids: did you guys have to learn both systems of nomenclature for chemicals (ie: ferrous, and Iron II)...
Does Australia use metric?