That wasn’t my experience a few years ago with a large groovy-dsl project. Since groovy will take a look in several different namespaces to automatically resolve things in a script, editors I tried had no hope of telling me what anything was.

Also, groovy allows modification of private instance variables which leads to … un-fun situations. I converted tens of thousands of lines of groovy to Kotlin. A lot of those lines were automated. Too many were not automatable for myriad reasons.

As far as the magic in Kotlin, I can easily click through all keywords and jump to the implementation in IJ. Groovy (at the time and in the project I was in) was utterly hopeless in this regard.