[ufo]

Haskell is a bit weird in that there are no niches where its a total killer-app and has the best libraries for everything. What its really good at is that it has a very solid type system and the core language is very clean, which encourages the use of powerful abstractions (for example: coroutine libraries for async IO, parser combinators, etc).

Out of the things you mentioned, server-side programming is the one where Haskell fits best. Server-side programming is more amenable to unusual languages because you get to choose your own platform and there are plenty of mature web frameworks you can use (too many of them, I might say). It might be worth a try to experiment writing code in a more type-safe language. Even the simple things like algebraic-data-types are things I miss a lot when working on other languages.