Another huge factor is that some people actually enjoy programming, which is not to say there's anything wrong with people who don't, but when you're having fun

Another huge factor is that some people actually enjoy programming, which is not to say there's anything wrong with people who don't, but when you're having fun writing code it's going to be much easier to be productive than when you view every task as a slog, and it honestly seems like there's more of the latter than the former. Again, I want to emphasize that there's nothing wrong with being a programmer who's not super into programming in most work environments, but along with aptitude, experience, and what not, actually enjoying the task can make a big difference.