I'm the co-founder/CTO of a startup and I agree: when I'm not in front of the computer coding, I'm always planning.

Yes, it's a rare day (but happens once a month) where I will step away from the computer and say, I'm digging myself into a hole and I should not code any more without a plan for how this will fit with the rest of the system, a plan for better abstractions, or a plan for testing, or whatever.

But that is because I spend a lot of time when not coding, thinking about these things, so the path forward is clear. And that higher-level planning usually happens informally, all the time, away from work.