All plugins are [almost] language independent and are designed to use with any language.
I agree that language aware refactoring is always better and precise. The pity is that it is not available for most languages.
Goodness gracious no, "worth noting" means "probably valuable or useful to think about or remember" (in this case in the sense of talking about an other edition/refactoring engine which might be better/more powerful for a very specific set of languages rather than in the general case).
Not "[the subject] is worth nothing".
In this case "that's a cool tool, though if you're specifically using Scala or Java Sublime-Ensime provides even more features".
Not worth nothing...