Software development is a created process, like writing fiction. Imagine a fiction writer doing a 60 hour (or hell, even a 40 hour) work week to try and get more work done. It just won't work, certainly not long term.
But you do need to put in the practice time to be able to be productive when you need to be. If your process involves a lot of procrastinating with intermittent bursts of brilliance ,you won't be able to be relied upon when things get tough. Stephen King became the writer he did because his wife would tell him to write a story, the baby needs diapers, and he did.
So before you can work smart, you have to know how to work hard. Otherwise you're just goofing off.
Yes, it is a creative process. I think that a better analogy is to a scientist though. Sometimes, scientists spend a lot of time thinking about what an experimental result means and planning out their next set of experiments. But oftentimes, they also have to crank through a bunch of experiments that they've planned. The more time they spend at that point, the further they get.
