Most of my experiences with Java were during college with Eclipse. I just remember finding it rather frustrating to have the autocomplete regularly popping up and showing me dozens of options without an easy way of learning more about em.

At some point I read through the Kotlin docs and found it interesting, but didn't have any projects in mind for it. I might try my hand again along with IntelliJ / Android Studio.

I've happily used other JetBrain products such as RubyMine and WebStorm.