I often find that trying to document code or a product forces me to rethink how I wrote it. Sometimes it's easier to change the code to make the concept simple to grok, then to write the documentation for the hard to grok concept. This is a very good thing.

Companies in general should do much more writing. Writing forces you to think in ways that coding doesn't. For me it's much easier to spot a poorly thought out argument then a bug in code (not a 1 for 1 comparison).