Sitemaps are pretty obvious benefit, but here's a short testimony. I run a small website, and I can testify that our sitemap (use http://www.sitemaps.org/ as reference) really helped us generate a lot of traffic. Our website got indexed a lot more heavily, which in part generated 100K unique hits a month.
On a site note, you can use www.google.com/webmasters to find out stats on how your website is being crawled by Google, and what needs to be improved.
TLDR - spend time building a good sitemap, it's worth it!
On a site note, you can use www.google.com/webmasters to find out stats on how your website is being crawled by Google, and what needs to be improved.
TLDR - spend time building a good sitemap, it's worth it!