I've only ever seen APL used for Advent of Code or similar.

It's probably pretty neat given how concise you can be (or perhaps terse might be a better term), but honestly it seems like the ultimate write-only language given its peculiar choice of symbology. Based on TFA it seems like you'd need to constantly hold CTRL to accomplish even the most trivial of tasks in APL so I question the viability/utility of it.

But in spite of all that it's still a cool programming curio to my mind.