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I've been knee deep in APL for the past year, working on a YAML parser: https://github.com/xelxebar/dayaml. It's still very prototypy, but for ~30 lines of code it's surprisingly complete.
The process of getting that project to where it is now really revolutionized how I think of software development in general and how I manage my dev teams at work. Our best practices and wisdom around software dev really are much more strongly tied to historical habits and tooling whims than we'd like to believe. I believe we as a community have a lot of unpicked fruits laying around if we shift focus onto the human side of Human-Computer Interfacing for a while.
About K, though, Arthur Whitney sounds like such a beast, and I would love to mingle with the K community. Within the array programming circles, APL/J/BQN form one cluster and K looks like it's off on its own a bit with different ideas and a laser focus on high performance. Extremely enticing.
you may also enjoy uiua (https://www.uiua.org/) which uses these alien glyphs but is even more alien because it's a concatenative language (stack oriented), like forth or postscript, but to make it even more alien it's written right to left. For example 1+2 is written "+ 1 2" (in forth it would be "1 2 +")
The language and the site are brilliant and I think worth 30m of your time skimming through and trying out the examples in the online editor / tutorial.
I'll third the ArrayCast, the host is Conor Hoekstra, a C++ programmer at NVidia Research. Regular panelists are Adám Brudzewsky[1] who works at Dyalog APL, Bob Therriault[2] who runs the J Wiki[3], Stephen Taylor who works with K and Q and cut his teeth on APL planning one of Chris Bonnington's Mt. Everest[4], Marshall Lochbaum who worked on J and APL and developed the BQN[5] language.
And their guests include Jeremy Howard, founder of fast.ai and Kaggle, Henry Rich implementer of the J language, Stevan Apter a K programmer and creator of No Stinking Loops site ( nsl.com ), Andrew Sengul who created April a blend of APL and Lisp, Morten Kromberg the CTO of Dyalog APL, Aaron Hsu creator of the co-dfns GPU compiler for APL, Brooke Allen a Wall Street entrepreneur and APL programmer, Eric Iverson son of Ken Iverson the APL creator and J designer/developer, Ashok Reddy former chemical engineer and employee at Rational (the UML people) now CEO of the KX company, Atilla Vrabecz a PhD Chemist turned K language entrepreneur, Leslie Goldsmith former APL developer at I.P. Sharp, John Earnest creator of the Ok language, Troels Henriksen creator of the GPU accelerated language Futhark, Lib Gibson former APL developer and consultant and project/developer manager at I.P. Sharp, programming polyglot Romilly Cocking, programming polyglot Vanessa McHale, and others.
[1] https://news.ycombinator.com/user?id=abrudz
[2] https://news.ycombinator.com/user?id=bobterryo
[3] https://code.jsoftware.com/wiki/Main_Page
[4] https://github.com/5jt/swf75
[5] https://news.ycombinator.com/item?id=24167804