It’s sort of minimalistic / lightweight alternative for IntellJ. Red Hat is working on the extension(s) which have worked fine for me at least for the past few years and it gets updates regularly.

I use VSCode for C++, C#, Java, Python and for things like docker-files, html etc. IntelJ is fine but a bit bloated in comparison with its menus, sub-menus, sub-sub-menus and built in unnecessary extra features for those just looking for code editor.

VSCode workflow with Java is mainly using it to write code, run tests, configure maven/gradle/docker/etc rest is more or less using CLI and Command palette.

VSCode is also fairly popular among Java developers.
There’s also Eclipse Theia Blueprint which is basically a open source clone of VSCode.