Even the UK has officially adopted the metric system; besides, I don't understand why people still refer to "inches" and "feet" in an international forum, when we should at the very least have both standards indicated for the sake of non-US/Burma/Liberia readers.
Not in aviation. As you're boarding your next flight, tell
the pilot when commanded by ATC to "descend and maintain 5,000" to ask the controller if they're referring to feet or meters and see what they say. (There are only a few exceptions in the air, and some on the ground.)