Want to know more about Dash? Check out how Amy uses Dropbox and Dash to make her day easier here!
As title mention. It feels like invasive when a program does thing like that in your computer and you have no control over it - I made a cleanup of my context menus and only Dropbox offers no option ...
It helps by allowing user to keep control of their Context Menu which can quickly become populated by programs - for someone who just want a drive, this addition in Context Menu just make it too crowded.