I'd probably rephrase "not" to "less". Haskell is sufficiently unlike other languages that a lot of knowledge/skills that are usually transferable between languages don't apply to it. That means you need to (re-)learn how to solve those problems in Haskell if you want to use it.

The end result is _usually_ better (e.g. Lenses are in almost all cases an improvement over getters and setters; Functors, Monads and Traversable are an improvement over imperative control flow), but damn it it doesn't take a while to get your head around those concepts.