Ha-agree, my whole professional life is in metric. But everything else is in inches and miles. It's madness. The USA should have converted to metric back in the 80s when there was a push to do so. But I think, even in Britain, they are officially metric and still talk in miles.
I did not like buying gasoline in Canada last summer though, and it always seemed they were trying to confuse me. $1.99 per liter seems cheap until you do the math. Then you hate Canadian gas stations. But I drove 10,000 km in Canada last summer and came to prefer metric measurements.
But in the end, metric is better, easier, more intuitive, and we should bite the bullet in the USA, convert quickly, and not look back.