The US isn't the holdout. Astronomers everywhere use light years and parsecs. Particle physicists everywhere use barns. Chemists everywhere use Angstroms.
Just because they're pretty, here's a link to the SDO gallery: https://sdo.gsfc.nasa.gov/gallery/main
Also, the SDO takes an image through each filter as it rotates through the filter wheel, IIRC, it takes 15 minutes to rotate through them all. They are then made available for each filter at different resolutions. Being the hacker-ish type, I wrote a script to use curl to download the image sequences for chosen filter/framesize for the sun's full rotation to create a one day timelapse.