It's a new company focusing on this exact problem. They offer tools like an IDE and deployment model. You can just sign-up on their website and start coding directly, you don't need to mess with setting things up. They also got School of Haskell which is a central place of really great tutorials ranging from tutorials on developing web apps to category theory stuff.
Check them out: https://www.fpcomplete.com/
There may be some benefits of using whatever FP Complete offers, but if anyone is struggling with getting Haskell set up on his computer with the official releases, then that person might need to acquire some other skills first before delving into the world of pure functional programming.
Of all the benefits I've heard ever used to sell IDEs, that's got to be the least common. Usually, things like syntax highlighting and error detection as you type, project management tools, version control integration, autocomplete, documentation/API tooltips, debugger integration, etc. are the advantages.
Some of those might be less relevant to Haskell than to, say, Java/C# style languages, but some of them would still be useful.
Syntax highlighting is part of any editor that is aimed at programmers, the interpreter does a great job highlighting errors, version control is done with git, and there is plethora of documentation on Haskell available too. Normally, ghci satisfies that need as well.
The fact is, you CAN do many of the things an IDE can do without one; its just generally harder, less discoverable, slower, takes longer to master, and for no real benefits. I would rather have a text box pop up saying exactly what types something has, and all the documentation about those types, and where it is defined in code, directly within my code in 0.1 seconds, then have to go and run some grep or hoogle search or whatever.
Code completion, syntax checking, looking up documentation, setting up projects and makefiles, code re-factoring, etc... Granted, Emacs and VIM will do most of this, and the language's tools will do the rest, but some people like having everything in one convenient package...