This is about learning a very specific skill that requires a lot of practice and building a "muscle memory". To some extent this applies to students and some top sportsman, too. For the rest of us, however, most of the work related problems are not about us not being skillful enough, but about the amount of (fairly simple) things that need to be done. That's what's eating time for most of us: easy tasks, but lots of them, day after day...