I have - and it's not that bad. The key is you have to have someone coordinating and driving a shared vision for the codebase and patterns. But it's hard to find people with that sort of passion and drive to follow-through as it's a multi-year endeavor with politics all over.
Otherwise its a thousand implementations of the same 100-line piece of code interspersed everywhere.
It seems like quality code management gets passed over by (bad) management because it looks like it doesn't directly move the project forward.
Which is strange because those same managers may be full adherents to micro tasking projects in a project management system whose purpose is basically to do for the project what code management does for the code itself.
In my workplace, we've recently had leadership that appreciates these things, and the difference is night & day. Simple requests from "stakeholders" (I hate that term) are often filled in days, or same day, instead of weeks. I think it helps tremendously that the primary manager is also a coder herself, and still codes ~25% of her job.
That's the problem with some languages - they lack a visionary, that drives the overall understanding of how things should be structured.
I believe it's Guido that basically said - if you don't like how Python does it, then implement it in C. And that's how you end up with great C based libraries bound to python... and python is often used as a messy orchestrating language.
Otherwise its a thousand implementations of the same 100-line piece of code interspersed everywhere.