I'm too old for that, it's like a language. I think in inches and have to translate to metric. When I see something I think that's about 2", I don't think its about 5.8 cm. I even have rulers that measure to the 1/32 of an inch.
That's funny, I was just about to say the same, just opposite way around...
During my time in NM in the 1970th, the US just started introducing metrics.
I was standing in line at a supermarket cashout, with 2 older ladies in front of me inspecting a gallon bottle of milk.
One of them said "This thing is 3.79 liters. I thought the metric system is supposed to make everything simpler."
Made me chuckle at the time.
After returning home, I noticed the same behaviour here.
Quite a few low profile goods are imported without being repacked for Continental Europe.
"This hot sauce contains 473,18 cm³, crazy Americans..."
I cannot speak for the Brits, but it looks to me that they are the only western nation to be more or less accustomed to both systems.