Lived in the USA for my first 40 years and mostly in Germany for the last 20.
Once I became accustomed to using metric, I find it much easier. All my projects around the house are measured in millimeters, centimeters, and meters. (How do you divide 13 5/8th inches into three parts?). Cooking takes some practice, however.
It helps I'm an engineer by profession and I know the conversion factors for most things. But I could easily live without English units of measure.
Just my two cents.

Tom