Assuming you write your code for a certain domain, I think most of your colleagues could follow along after learning a little k.
I wrote a toy simulator for the domain I work in using something like 6 lines of APL code and sent it to someone good with APL. They replied back to the email pretty quickly with some tips on how to improve it and could generally get the gist of what I was trying to do while knowing nothing of the problem domain. It was really an interesting experience. I think with zero doc, a colleague of mine would immediately understand what I was doing after going through a short APL tutorial. It isn't magic, but not nearly as cryptic as people make it out to be.
Edit: people do comment their APL code. I think a million loc project would be pretty difficult in APL, but the beauty is that you should be able to do some pretty powerful work in a few pages I would imagine.
I wrote a toy simulator for the domain I work in using something like 6 lines of APL code and sent it to someone good with APL. They replied back to the email pretty quickly with some tips on how to improve it and could generally get the gist of what I was trying to do while knowing nothing of the problem domain. It was really an interesting experience. I think with zero doc, a colleague of mine would immediately understand what I was doing after going through a short APL tutorial. It isn't magic, but not nearly as cryptic as people make it out to be.
Edit: people do comment their APL code. I think a million loc project would be pretty difficult in APL, but the beauty is that you should be able to do some pretty powerful work in a few pages I would imagine.