I say yes, for a two reasons. 1) Enforced purity means you can't just fall back to your old imperative style as coding and use it as a crutch, and 2) it's the "most different" functional language, it will expose you to more than just functional programming and thus teach you more.

Learning Haskell will teach you: pure functional programming, algebraic datatypes, laziness, and ML-style types. All of which are worthwhile imo.

ML-style typing and algebraic datatypes you could also learn in F#/Ocaml/SML, but pure FP and laziness are two things that are very much worth learning and only apply to a handful of languages. And of that handful Haskell is really the only one with an ecosystem and community that makes it practical to write actual projects in.

Go further.

"Mountaineering is often called Alpinism, especially in European languages"

Haskell is not that hard to get into: there are hard parts but they are totally optional and avoidable.

Also for newcomer who want to get in fp but find Haskell intimidating, you can try Elm, it's tailored to cater to beginners.