There’s no actual Me Menu anymore, but there’s a similar menu bound to your username, and it is integrated within indicator-session. There’s a configuration key that allows for the user switching portion of indicator-session to be hidden. Indicator-session uses dconf for storing its configuration, so you’ll need the tools to tweak dconf:
$ sudo apt-get install dconf-tools
Start dconf-editor and untick /apps/indicator-session/user-show-menu. Log out, login.