I grew up with Imperial, but I'm happy to use either. I think the advantage of the Imperial system is that it is based on human dimensions (inch = thumb joint, foot = foot, mile = 1000 steps, furlong, chain, etc) so it is more intuitive than a system based on the length of a random steel bar in a fridge somewhere. But with the advent of calculators and computers, there is no question that metric is easier and more useable. We will eventually be 100% metric, I am sure, but I will regret the passing of the old system. However, if I feel too nostalgic I always remember a conversation I had on a motorcycle forum where we were discussing tuning modifications. An American guy chimed in with (to paraphrase) "What you need to do is machine about nineteen and one-half sixty-fourths from the surface of the cylinder head." Now that IS crazy.Imperial all the way, except fractions. mm are much easier to visualise and comprend than 3/32, 8/11th etc
FWIW, when I make a table, I plot out in my head the length in feet, the height in inches, and the wood stock in inches or board feet, because these make more sense to me. When I do the actual making, everything is in cm, except for any intricate joints, which I measure in 1/10th mm, because calculations are simpler. Horses for courses.