Ask a German what their car's power is in kW. It's been more than forty years since PS (HP in German) has been relegated to merely tolerated, as long as the kW number is presented as the primary statement, but people still think in horse powers when talking about cars. Perhaps we are an outlier in the metrified countries, but I'm not convinced, I believe that gp is right.
Other examples are screen sizes: I have no intuition at all about how big 5.5" actually are, but I know where in the current phone market 5.5" would fall (awesomely non-huge!), whereas to my mind, the metric equivalent would carry no information at all ("bigger than a stamp, smaller than a TV"). And for sensor sizes you even have the situation where the imperial number is a "size class" with very little relation to actual size, whereas the metric number usually describes actual size. Completely different numbers. All countries use a combination of metric and some other system.
that's common, but not as units of measure, but as marketing.
Same as megapixels in photo cameras.
Nobody measure power in HP, we say "that car has 85 HP" only in speech, but when it matters (for example on car papers) power is express in KW and screens are measured in cm that are also written on the package, they are only marketed in inches.
You would be correct if people had an idea of how much power 1 HP is or the surface of 1 MP camera shot, but they don't know, they only know that 16 MP > 12 MP and 300 HP > 100 HP, they (we) ignore what it actually means.
It is also perceived completely differently depending on context.
A 120HP tractor is not the same thing than a 120HP car or a 120HP motorbike.
According to US measures I'm 5'11, which means nothing to me, while it's obvious to them, because they actually use foot and inches all the time and do math using them.
Other examples are screen sizes: I have no intuition at all about how big 5.5" actually are, but I know where in the current phone market 5.5" would fall (awesomely non-huge!), whereas to my mind, the metric equivalent would carry no information at all ("bigger than a stamp, smaller than a TV"). And for sensor sizes you even have the situation where the imperial number is a "size class" with very little relation to actual size, whereas the metric number usually describes actual size. Completely different numbers. All countries use a combination of metric and some other system.