IDEs can help to learn programming and can facilitate exploration. Step-by-step debugging and refactoring are a crapshoot in less advanced editors, but both are powerful learning aids if they are easy to access - which they are in IDEs. Both IntelliJ and Eclipse are very easy to explore - just point-and-click, no need to set anything up if your language is well supported. Experienced devs also benefit, since IDEs are made to manage and navigate complexity that will inevitably show up in any mature codebase.

Your runtime and tooling will always be a dependency, and you will always have to learn enough to troubleshoot it regardless of the language. PHP, JavaScript, Ruby and Python are no different to Java - the SDK must also be installed and kept upgraded, you still have to fix your application to work with a newer runtime when the language changes or when fixes are backwards-incompatible, and your SDK version might still clash.

Performance is not an issue in practice. I only ever noticed IntelliJ being slow on a machine that was too slow to run a web browser, and I don't think that such machines would be very common because people would just get rid of them. Resource use has ballooned over the past few years due to the rise of Electron, so your machine already needs to be powerful enough to run Discord, Slack, Postman, or whatever other applications you wish to run in parallel. Adding a JVM alongside that is not much of an ask, given that IntelliJ consumes around 500 MB with two fairly sizable projects open.