No kidding, I tend to wait for Jetbrains to support things officially before seriously trying new languages. I just need my refactoring tools.
It's worth noting that the IntelliJ IDEA Java IDE was Jetbrains' first and it is written in Java. A few years later they invented Kotlin with a focus on strong IDE support. The language was designed from the beginning with tooling in mind.
I would suspect if a language advertises it has superior reasoning capabilities about code that should also enable a superior IDE experience as well. Where are those IDEs?