I run dark on my Mac, but use Xcode with a modified default light theme (off-white page background, with high-contrast monospace sans-serif text). Same with BBEdit (my general-purpose text editor). I use a translucent dark for Terminal, though. I don’t spend much time in CLI.
For whatever reason, it allows me my greatest productivity. I don’t really care why. I’m constantly coding, so it’s important for me to be comfortable. I’ve tried dark page backgrounds, a few times, and never became comfortable with them.
I’m not particularly interested in impressing anyone, or being perceived as “cool.” That ship has sailed. I am definitely “uncool.”
But I get a lot of stuff done, fairly well, and quite quickly.