It can be that your learn a language better, became more comfortable with the way it must be used: say, stopped writing code in Elixir the way your used to write in Python.

But the other thing is that it's in our human nature that we tend to look for something positive in bad situations we exposed to for a long.

Say like, PHP was a fractal of shit, but when you use it for a long you will notice that it will make you more aware of what functions to use and how not to fall into some undocumented craphole, be more responsible, and do not take it for granted that some function would work flawlessly. The obvious benefit from the shitty situation.

EDIT: Grammar