I use imperial measurements exclusively for woodworking. That's what I grew up with and what I'm familiar with. For me, I can look at a bolt and know it's 3/8" or a board a know it's a 1 x 6. I can spot 8' or 40' by eye. I can't tell what metric size something is without measuring. In addition, tools and supplies are generally imperial.
Metric is a well thought out system but it never fully displaced imperial here in the states. In woodworking and the trades, imperial remains the norm.
However...
I can't buy a liter of milk at the grocery store but I can get a 2 liter of fizzy sugar water. As for wrenches, I need full sets of both. It's not uncommon to have a mix of each. One part metric, one part imperial. And what about marathons? 26.2 miles (based on Pheidippides run from Marathon to Athens) and often connected with 1/2 marathon and 5k and 10k races.
Goofy world we live in...
-- Dan Rode
"We are what we repeatedly do. Excellence, then, is not an act, but a habit." - Aristotle