Like a moth to flame, I'm drawn to Haskell every 6 months or so. What drives me to it is its ability to express concepts (once you're used to it) parsimoniously - like the point-free style in the example. Monads, I can understand/manage. But by the time I hit Monad Transformers (and the n different packages available), the excitement turns into a headache.

It's also a bummer that you need the containers package for basic DS. So, batteries not included, unlike Python. This also means that you need to use a package manager (stack or cabal) even for non-trivial programs, where a one-line ghci command line would have been more ergonomic.

That said, learning Haskell has had a very positive effect on how I think about and structure the programs I write in other languages ("functional core, imperative shell"). I don't think I'll ever program in Haskell in any semi-serious capacity. But these days, I get my daily functional fix from using jq on the command line.