I would say that for the specific use-case of a modeling layer for something like constraint programming, SMT, or MIP, full operator overloading is superior. I've written such layers in many languages and used them in even more languages, and it really does help a _lot_ to have the standard mathematical expressions. All the other alternatives become way to cumbersome to write effective models with in my experience.

Is it worth having operator overloading in a language or not? That is a different question. People do bad things with every feature, including operator overloading. I'm slightly in favor of it, but I'm not a fan of using it for anything other than either immediate arithmetic or creating expressions trees representing arithmetic.