Effective use of semantic HTML will alleviate much of your traffic being jammed up on your homepage. Without accessible navigation, your visitors will not find what your website has to offer, and will be stuck on your homepage. If you look at your server logs (or Google Analytics, etc.), do you find you have a high bounce rate, or incoming traffic lands on your homepage, only to leave from it without heading off via your navigation - to a relevant page they'd most likely convert on? If you want to manage any traffic jams on your sites, how many of you agree with me that semantic HTML (and accessibility) will go a long way to funnel your visitors to the areas they need?