I find people who 'do' and don't 'read' annoying. They tend not to understand their current cultural and mathematical context and end up re-inventing the wheel in their products.

These are the guys who tweet about 'this cool new language, Lisp' and talk about basic CS algorithms as if they were breaking news, discoveries that will disrupt the industry.

That said, at the end of the day, yes: doing is great for understanding.