So yeah, I wanted tabs in Safari. Or something like tabs.
But since discovering that the "Window" menu in OS X is not painful to use, and that CMD-Backquote rotates between open windows, I've not missed tabs an incredible amount. I think my tab usage was a response to my experience with Windows and Linux window managers, though even those have changed since I started using tabs in my browser.
However, I still love using pwm as my window manager under X11, with its tab collections and windowshading. Go figure.