Note that you can translate the skills you learn from Haskell to other languages. The way I write code in Python and Javascript for my day job has drastically changed after I have learned Haskell.
The major change which I see is how the Python code becomes more pure. Using code which are side effect free gives me the ability to easily reason about them. I can jump in the code even after many months and easily understand them without trying hard. Using function composition to glue things makes complex system very simple.
