Hmm, measurements DO surround all life, but the conversions for a design project would be a pain in the ass if it were to be converted between imperial and metric, and vice-versa, but practically speaking, with all the insane technology surrounding us, I'm sure somebody has thought up a simple converter program, on that note one that can loop through all of the measurements on any kind of technical drawing
Even so, anybody who would create a technical drawing will definitely produce a metric version for any foreign businesses that need to look at them
And for the average tourist, it still really isn't that bad, the only scenario I could think up thats worth a curse would be if you were to go to a new country every 2 weeks, and then return to the USA, and then do it all over again for the rest of your life
But by that time you'd probably have had the conversion equations written on a little sheet of paper next to your new $5 calculator sitting in your pocket