I do love Haskell too, but I am only a dilettante. I played with Euterpea[1], and I like it's mathematical bent like J and APL. I could probably get more practical work done with Haskell, but I like the way J and APL make me iterate on a short piece of code until it is a diamond. I should look at Haskell again...

I sometimes write J by hand on paper.

[1] https://www.euterpea.com/haskell-school-of-music/