I know it's all old hat to the IntelliJ crowd, but I just don't like using an industrial IDE if I can help it. Metals lets me stick with a lightweight editor like Emacs or VSCode while keeping the great tooling that a powerful type system like Scala's enables.
I still fire up IntelliJ from time to time for certain types of mechanical refactoring, but as Metals has improved I find those cases come up less and less.
Big props to the Metals team, and thanks for all the hard work.