Here's a me Too....
I'm using vs2012 Ultimate. And resharper.
With resharper intellisense set to ReSharper, code snippets such as prop etc... work, however not the mvvminc etc... code snippets.
I enabled the Visual Studio option under Resharper->IntelliSense->General then both the prop and mvvminc code snippets worked.
Seems a bit odd that the default snippets work with resharper intellisense enabled while at the same time the mvvm light snippets don't.
Thankfully I don't have to restart visual studio for the resharper intelisense changes to take effect allowing me to disable resharper intelisense to add mvvm light properties easily with the code snippets.
c ya.... - jeffa