I've yet to work with anyone outside of an undergraduate class that over-commented their code.
It takes effort to over-comment code, and those that do are invariably writing both poor code and poor comments.
A much more prevalent malaise is that of developers with an unduly high opinion of their code's readability grossly under-commenting their code. This increases the long-term maintenance overhead and sometimes leads to forced rewrites by follow-up maintainers (which may be the author himself).
http://steve-yegge.blogspot.com/2008/02/portrait-of-n00b.htm...
His "over-commented" example is clearly extreme hyperbole.
His under-commented counter-example is extremely poorly commented code which fails to explain the "why", ensuring that nobody can make sense of the code path without actually stopping to read the entire expression and possibly the expressions to which it refers.
More often than not, if someone is under-commenting, it's probably just out of laziness. However, if someone is over-commenting (which is possible in my opinion), chances are that it's because they believe that what they are doing is correct. Personally, I think posts such as this would be better to programmers in the latter category. A similar post aimed at the lazy under commenter probably would have no effect simply because such a person has been told they need to comment more throughout their programming careers.
That said, it really wasn't my intent to tell people they shouldn't comment. Rather, I'm merely trying to get people to think more about the comments they make. And that's not a bad thing all things considered.