Re: [Haskell-cafe] What features should an (fictitious) IDE for Haskell have?

Absolutely agreed from many many years of experience. It almost always ends up being less painful to just use the upstream's binary bundle (For the reasons you stated.)... but perhaps I've been spoiled by the (relative) good quality of Intellij IDEA's bundles.

Eclipse works, too. I had been using it for years before I had to switch for work-related reasons - IntelliJ has some strengths and some weaknesses compared to Eclipse, and it depends a lot on which of the two got more love and attention in the previous years.