Comment by EvilTerran

it usually takes longer to come up with an initial Haskell solution. But then that solution is usually very clean and elegant

The big thing that jumps out at me like that in my experience is: it takes longer to come up with an initial Haskell solution that compiles, but when it compiles, it almost always works first-time; while, in a less rigorous language, I can get it compiling a bit sooner, but any time saved there is lost many-fold when it doesn't actually work.