Recently i found a new hidden gem in SharePoint: Site Usage Reports
when you navigate to a site like http://moss01 this will redirect you to the page http://moss01 /Pages/Default.aspx.
Replace Pages/Default.aspx with _layouts/usageDetails.aspx and you'll receive a very clean and simple usage report page.
Discription of the page:
Use this page to view a detailed usage report for this Web site. The report does not include data for sites under this Web site. To see detailed data for these sites, see their corresponding usage reports. For usage information on all sites in this site collection see the Web site collection usage summary.