I think it's great for mathematicians, but I shudder to think what some Scala library builders might do if they get there hands on this.
> but I feel I wouldn't like a code-base that abuses it too much
This is why I think it was a poor design choice to include the feature and actively encourage its use. The benefit of potentially more succint code is far outweighed by having to look with a codebase written entirely in Greek and there's no way to enforce moderation.
It's impossible to impose moderation in any language and you don't need unicode characters to write stupid code. Java programmers were writing HelloWorldFactory classes way before Julia existed.
Julia editors or VS Code with the Julia plugin support LaTeX commands and will perform autocompletion and convert it to the unicode character.
For example, if you write \nabla it will offer autocompletion and write ∇.
I think it's a neat feature and makes a lot of sense in scientific computing contexts but I feel I wouldn't like a code-base that abuses it too much. Sprinkled here and there can help make code more readable, succinct and pleasant.