When I describe myself as interested in a human-centered developer experience, I'm making a reference to Don Norman (google Nielsen-Norman Group, or The Design of Everyday Things), who believed in human-centered design. I believe in not belittling the user/developer when they misuse an interface (website, CLI, API, what have you) but instead trying to understand what kind of internal motivation caused their behavior when it's unexpected to me. Making changes based on that leads to a good developer experience.