IntelliJ use wasn't that widespread until about 10-15 years ago. Java was thriving before that.

It was in heavy use in London investment banks in 2005. Even resharper was commonplace by the following year.

Around 10 years ago Eclipse was still the primary editor in the circles I was in.

Still is on my circles, and at home I have been always a Netbeans fan.

I am an IDE guy since Borland products for MS-DOS, yet I was never sold on InteliJ anyway, and Android Studio made me dislike it even further.

I was using Eclipse back then, but indeed Wikipedia says IDEA 1.0 (Jan 2001) predates Eclipse IDE (Nov 2001).

NetBeans was bought by Sun in 1999 and opensourced on Jun 2000.