Forum Moderators: buckworks
In my opinion, the downside is that the need for a site map sometimes (often?) points out a flaw in your general navigation system that leads visitors and spiders to look for an easier way to find what they are looking for.
Maybe that's a benefit too, because it alerts you to something that might be very profitable if fixed.
And lastly but most importantly does its high usage indicates something?That depends on where the traffic is comming from, could be your visitors use it because they can't navigate the site, could be search engines spidering the links.
A site map can also provide a handicap accessible way for someone to surf your site. The best traditional site architecture & navigation in the world can give a blind browser touble. A site map is an easy answer to this.
While you are not required to have a handicap accessible site (unless you are a government sponsered agency in certain countries), a few sites are in the process of being sued for not being handicap accessible so I imagine that the whole thing will come to the forefront eventually.
Always better to be ahead of the game rather than behind it. ;)