For the semi-comatose and above, its always been my belief that a car insurance salesman offers no value whatsoever.
Example: Recently switched to the big evil progressive. I told my agent I was leaving his services, wished him luck, etc. How did he respond? First he tells me I will regret it because I cannot contact a personal agent. Lets see... last time I needed him, it was saturday and he didn't call me back. I can call Progressive's 1800 number any time night or day.
Second, he tells me that if I have a claim my rates will 'skyrocket'. Well, progressive publishes a table telling me upfront what my rates will be if X happens. Not to mention, I'm pretty clean, so I'd rather save $400/yr anyway.
Third, he claims that if I go to Progressive,Geico, et al. that I will never again be able to obtain coverage from full-service companies. What a bunch of baloney. You can see why they are going the way of the dodo-bird.