Ask HN: Does being a coder professionally ever inhibit you from improving?

For example, say you code the same type of C# every day. Or worse, say you've found your way onto a team with developers who don't know the language and certainly don't know how to do anything but write in that very basic C++ style that you learn in programming 101. At that point there's no point for you to improve because it doesn't matter what you know.

Another example is how you often times have to spend all day working. After sitting still in a chair being torture forced to figure out someone elses astonishing code for 8 hours I don't want to go home and sit in a chair and code. I want to join the local fight club.

Another example is it's incredibly aggravating to me when I know all about a subject for some reason (perhaps learning about it off work or at a previous job). By chance this subject comes up at work and I try to steer the team the right way but quickly discover how little my expertise matters in a room full of ignorant decision makers.

Have you ever noticed that being employed as a programmer actually caused you to become a worse programmer? Do you have examples of your own?