It's very minimal-boilerplate. It's done an exceptional job of eliminating procedural, tedious work, and it's done it in a way that doesn't even require macros! "Template Haskell" is Haskell's macro system and it's rarely used anymore.

These days, people mostly use things like GHC.Generics (generic programming for stuff like serialization that typically ends up being free performance-wise), newtypes and DerivingVia, the powerful and very generalized type system, and so on.

If you've ever run into a problem and thought "this seems tedious and repetitive", the probability that you could straightforwardly fix that is probably higher in Haskell than in any other language except maybe a Lisp.