Java has the best IDEs, because as a language development is essentially impossible without one. contrast with Go where I can put as many types into one file as I like, and I can (and do) use Go without an IDE, both personally and professionally
What part of Java development is impossible without an IDE?
It's a stupidly simple language.
Just because people actually use it and thus IDEs were developed to aid the development process doesn't make it a necessity at all. I have programmed Java countless times from vim without any plugins. The only pain point is imports, which would be similarly painful in any other language ever created.