[AnimalMuppet]

Late reply; I didn't see this earlier.

But in Haskell, a lot of the time you don't use a monad because you want a monad. You use a monad to do something else - to log in a pure way, for example. That use of a monad to solve a particular problem is a pattern.

I'd even argue that it's using the pattern to compensate for a weakness of the language. (Or, if you prefer, to help with things that are difficult within the language design and philosophy.)