At work, we have some customers who want to use WebLogic and Websphere, and last time I checked those don't have versions that support anything beyond Java 8.

I still use Java 8 even on personal projects. I'm migrating those to Kotlin, so I'm at least not held back with regard to programming language features. I could upgrade those to Java 11 (or 12), just haven't prioritized taking the time to do that over other tasks, and the benefit would be minimal for these particular projects.

When using Java 8 language, I'm just happy to have lambdas and streams. Java 8 was the biggest improvement to Java language since 5 -- and I'd say it's a bigger leap that 5 was.