I have both a personal Dropbox account and a work one. The two should never cross paths as I don’t want either’s data contaminating the other. Dropbox still does not natively support the use of 2 accounts, however this simple Automator application works. Even in Mavericks.
The one issue I did run into was that Bartender would only show the 1 Dropbox menu bar icon when in Bartender. Moving it back to the menu bar shows both.