I'm not talking about any particular brand of computer nor OS. I do the same thing on a Windows machine if the mouse doesn't have a third button.

But to bring up current Mac portables, the current iteration of the track-pad is infinitely more usable than anything found on an Acer, Sony, Dell, etc... Both for cursor movement as well as button presses. But looking at it, it appears to have no buttons at all.

Wait... Is tabbed browsing even supported in Windows?

I've never owned a single-button mouse by the way. Every mouse I've ever used in Mac OS has always had multiple buttons and a scroll wheel - and all the buttons and wheel have always been supported.