Great!
As much as I love Kotlin and have a great deal of respect for JetBrains, I’ve always preferred the other Java IDEs over IntelliJ. The fact that choosing Kotlin—which I genuinely do prefer—effectively locks you into IntelliJ for the foreseeable future has been one of the main reasons I’ve hesitated to recommend it unreservedly for every project.
Just to be clear: I think IntelliJ and the rest of JetBrains’ tools are excellent and absolutely worth the price. I simply happen to prefer the alternatives—and they happen to be free. That said, I realise this is very much a personal preference, and one that most others don’t seem to share.