what they are pointing out is not that humans might find it easier, not that it is better for SEO, just that it is not 100% necessary - like it once was…
I have seen the change from no variables, through to one variable, and now as many variables as your want in the url… Just don;t confuse them with too much crap!!
the example they give:
http://www.example.com/article/bin/answer.foo?language=en&answer=3&sid=98971298178906&query=URL
logic dictates taking out the session id, and query part… Leaving en, and 3… The language part is not really that different whether you re-write or not, and if you drop an article id of 3 into your rewritten url, then you are not rally benefiting (probably loosing out on load time if your on a shared host, as it will take longer to translate the page address, and therefore load).
But SEO URL’s would not look at the above like this… They would possibly replace the “3” with the article title, jamming it full of keywords. And as far as i am concerned, keywords in your URL, as close to the beginning as possible are still valuable - people might disagree though!