I don't know a lot of people that still use Visio. It's one of those forgotten Office applications, much like Microsoft Access or Publisher. But, those that do, find it extremely valuable for including Visio diagrams in project plans as infrastructure maps.
Microsoft has now released a new stencil kit for those deploying Microsoft Office or Microsoft Office 365. The stencil kit includes over 300 icons to develop deployments for Microsoft office products including Microsoft Exchange Server 2013, Microsoft Lync Server 2013, and Microsoft SharePoint Server 2013.
The download is available here: New Office Visio Stencil