AWE using 24GB of RAM SQL Server 2012 Because my memory seemed to be rapidly disappearing (according to the Task Manager graph), but I couldn't see any programs using it, I downloaded RAMMap to get a better picture of what's going on. Turns out all of my memory was being chewed up by AWE.

When I try to research this, however, everyone seems to say that AWE isn't enabled for SQL Server 2012 64 bit systems, since it isn't needed; the expanded memory that AWE would enable is directly accessible. But the system still will happily chew up memory in AWE until it reaches its limit.

How can I disable this and free the 24GB ram?
I would recommend you to read this article:
https://blogs.msdn.microsoft.com/psssql/2009/09/11/fun-with-locked-pages-awe-task-manager-and-the-working-set/

It covers all possible questions about AWE and answers to them
Also you might find the post from Paul Randal helpful:
A SQL Server DBA myth a day: (5/30) AWE must be enabled on 64-bit servers