When you spend 99% of your time on the terminal, it's nice not to have to use the mouse... _at all_. And this is quite close.
OS X has a feature called "Full Keyboard Access", that needs to be enabled before the following will work.
Ctrl-F1 Enable/Disable Full Keyboard Access
Ctrl-F2 Access Menubar
Ctrl-F2 Access Dock
Ctrl-F7 Navigate controls in current dialog
More full-access shortcuts at the Apple Support Page.