I'm in the same boat - I've been a very happy IDEA user for over a decade now, and any other IDE that targets the JVM has a pretty high bar as far as I'm concerned.

With that said, I'd love to see the Scala equivalent of this - the Scala plugin for IDEA works fairly well (they still have quite a few problems with inline error highlights/parsing when your Scala code uses path dependent types), but the Typesafe official Scala IDE uses Eclipse, which utterly rules it out as far as I'm concerned.

A lightweight but functional Scala-native IDE with builtin sbt support would be absolutely awesome for a pure-Scala project.