First class effects and type system enforced purity have made my life as a programmer so much better. They dramatically reduce the size of the state space that must be reasoned about, and having all context being declared in a function definition makes it trivial to really grasp what any given function does.

I do agree with the points about language extensions (and I have certainly cursed my fair share of operator heavy point free code), but until someone makes something better (maybe that thing is even lean4?) Haskell still brings me more joy than any other production ready programming language.