After being in a confusing half-and-half state almost forever I finally bit the bullet today and fully converted my shop over to metric. I replaced all the inch measuring strips on my saw fences, got metric blades for my Starrett squares, bought several new Tajima metric measuring tapes (really nice tapes!), and sketched the plan for the coffee table I'm starting to build in units of even centimeters. I even milled some lumber to 65 mm for the legs, having learned how to set the DRO on my new planer to mm.
I'm seriously looking forward to never worrying about what a third of 11/64ths plus 5/16ths is ever again. I'm too old for that stuff.