Hoogle is pretty nice, and few other languages had an equivalent until quite recently.
I'm hopeful that cool type-powered IDE features will start to arrive once haskell-ide-engine is a bit more stable. It's getting there!
There are some pretty awesome IDE ideas in Haskell-ish languages like Idris [1], too. There is some movement towards dependent types in Haskell, so it might get similar features one day.
Well, we have Intero (https://haskell-lang.org/intero) now.
That has little to do with code completion, which is more about API discovery than saving on typing. It seems like many Haskell enthusiasts never figured that out, so they didn’t bother with it in tool development. Which is funny, given with all that extra strong typing, they might be able to come up with an experience that is much better than the other languages, but I guess not yet.