Those places are basically unicorns, as far as I can tell. I have my own anecdotes, of course, and they oscillate between "we cared about code quality" and "we didn't have time." My experiences and the conversations I've had with others lead me to the conclusion that: almost all of us have deadlines that we didn't really help set, that we're always struggling to meet those deadlines, and that there is a stupid amount of money on the line that drives these decisions. And, so it goes, "get it done and ship it yesterday" is the commonality that I see.

That said, despite the frustration, I do try to hold myself accountable for writing clear and concise code as much as I possibly can and off-setting the times when I have to commit some clever hack with long-form narrative style comments.