Having owned an MSP (Managed Service Provider), with hundreds of customers, and thousands of machines under management, vPro add's enormous cost savings when implemented.
Customer has a blue screen? No problem, you can KVM right in and see the issue.
Workstation hung after remotely applying patches - calling the user and saying "Can you go over and hold the power button for me?" is no longer necessary. Simply shutdown the machine via vPro and power it back on. Even remotely re-imagine a machine from backup is possible.
However, my favorite use case is the instant back to work use case. End user hard drive fails - obviously a truck roll is needed, but the most important thing is to get the user productive again. Leverage vPro's ability to redirect IDE (IDEr) to a network Live Linux CD at least gets the user in to Web Outlook, if not 100% back in business.
How about power savings? Schedule machines to auto shutdown at night, and for your patch window, use vPro to power up the workstations, apply the patches, power down (from windows) and if a machine hangs on shutdown use the vPro power off command. Allows for nightly maintenance and keeps costs savings maximized.
Rolling out vPro can be a bit of work using native tools, but there are solutions available (shameless plug) like LabTech Software (http://www.labtechsoftware.com) which can remotely provision and manage vPro along with any other IT management function you can think of.
Full disclosure: Having ran an MSP and worked with many enterprises, out of band management tools were critical in every mature organization I worked with. As a co-founder of LabTech Software, I have engaged Intel and we are working closely to build out solutions that vPro truly solves for.