The only thing we use imperial for now is height and pints in the pub.

There's a really good reason for this, the first being that there is no metric equivalent of a pint because if there was it would be 500ml and an imperial pint is 570ml, nobody wants less beer in their pint. Poor Americans have a 475ml pint.

The height one (and any other remnants of imperial numeracy) is largely due to American cultural media exports and it's easier for non Americans to convert to American imperial units due to exposure to both, to engage in effective communication.