It's a fantastic unit if you need to convert distances from metric to imperial, because 1 furlong = ~200 meters. So if you tell someone something is half a kilometer away and they ask what that is in imperial, you can quickly respond "2 1/2 furlongs".
A furlong, the approximate distance that an average draft horse can pull a single-bottom plow before needing a rest, is my favorite measurement because it sounds so grounded in reality. It's just how long the furrow is.
Right next to the parsec, but only because of the Star Wars references :-)
As much as we like to point fingers over the Atlantic, here in the UK our roads are mostly imperial except heights and widths which are in both feet and metres, because lorry drivers from the Continent kept crashing into bridges!
They are even (in our wierd measument system), and reasonable distances for different engines to run out of power/traction/other factor and thus not accelerate as much.
Many short races, for feet or horses, that started way back when are some number of furlongs.