The hard part of this is that most companies aren't willing to support it (monetarily). You're expected to spend most of your time coding or, at best, thinking about the next problem. Thoughtul reflection rarely gets the support it ought to.

That said, I think it's worth investing your own time in doing it. I feel a lot more at ease when I take time to think about my work, and I think it pays off in my own career in the long run, even if it costs me some of my own time.