If you go to the Chrome Web Store there is a collection of applications that will run from and save to your Google Drive:
So far the list isn't too big, but there are some handy tools, like LucidChart which I have been using in place of Microsoft Visio.
Another bonus was that because I purchased some extra storage for Picasa a while ago I now have 30GB to use across Google, including Drive.
What are the benefits of Drive you have found? Or have you decided not to use it and why?