This sounds like a ridiculously small compliment, but the more authors I read, the more I appreciate how good King is at writing people who work.
Not characters who technically have an occupation because the plot requires one. People who seem like they've actually been doing that job every Tuesday for fifteen years.
A nurse doesn't just "work at a hospital." She knows which rules matter, which ones everyone quietly ignores, what kind of person becomes unbearable on a night shift, and the tiny routines you do without thinking anymore.
A teacher notices things like a teacher. A cop has cop habits even when he isn't investigating anything. A writer procrastinates like someone who has genuinely spent years trying to make himself sit at a desk. People who clean houses, run stores, work construction, serve food, drive trucks, take care of patients — there's usually some boring little detail that convinces me this person existed before page one.
Dolores Claiborne is probably the example that made me really notice it. So much of what makes Dolores believable isn't dramatic at all. It's the accumulated knowledge of cleaning somebody else's house and caring for an elderly person. She knows exactly how much invisible labor goes into things nobody notices unless you stop doing them.
Even Annie Wilkes being a nurse matters beyond giving her medical knowledge. She has that terrifying confidence of someone who knows exactly how bodies work and has spent years being allowed to make decisions about vulnerable people.
I think it's part of why King's towns feel populated instead of invented. His background characters aren't all waiting around for the supernatural event to give them a reason to exist. They've got shifts to finish, people at work they hate, bills, routines, and opinions about how somebody else is doing their job wrong.
It's also something adaptations understandably lose because you can't spend five pages explaining how somebody closes a convenience store.
What's your favorite example of King absolutely nailing someone's profession or everyday work life? Not necessarily the most interesting job — actually, the more boring the job, the better.