I am a scientist 1st, but an amateur chef a very close 2nd and I live in the US.
In my scientific life, I of course use metric. Nothing else makes sense.
In my cooking life, I've adapted recipes from the 2000s, 1900s, 1800s, 1700s and, yes 1600s. It's bad enough interpreting archaic English wordings and "gas mark" oven settings to degrees Fahrenheit. If I had to translate my 100s, if not 1000s of recipes to kg, ml and celsius as well, I might as well give up and just order Pizza Hut the rest of my life.
Other "specialties" I've heard with similar concerns. Try breaking down a '68 Mustang with a metric wrench. Try measuring for a replacement truss on the Golden Gate Bridge with a metric tape measure.
I don't see it as a concern, anyway. I "grok" that a liter is "a little more than a quart," that a meter is a "little more than a yard." Celsius I usually need to do the math, but that comes up less often. What's the big deal?