My experience has been that the US and Canada are still "mixed" enough that it's highly noticeable. And I hear it's similar in the UK. The main differences are

My experience has been that the US and Canada are still "mixed" enough that it's highly noticeable. And I hear it's similar in the UK. The main differences are absence of an official government position (UK and Canada both have that, but with exceptions and/or significant numbers of people just ignoring it), and we still use Fahrenheit for temperature (amusing since the degree Celsius is arguably less "metric" and more just SI). Otherwise, it seems a largely arbitrary toss-up as to what will be metric in any of the three countries and what won't.