Please note an error in the SQL 2012 documentation for Lock Pages in Memory which indicates that it's deprecated. It's not. Locking pages in memory is a useful feature and there are no plans to deprecate it. It looks like it was accidently included on this page when we made changes to deprecate AWE.
So.. keep using it :-) The documentation has been fixed and should appear in Books Online in the next refresh by mid-April.