(I hate finding myself leaping to MS's defense, but...)
With Win8 You still have a COMPUTER, not a tablet. It will run several programs at once, you can Alt+Tab between them, there's a desktop where you can pile up all those icons if you're one of those users and once you're past that "annoying Start screen" it acts like any other computer. I know there are some more important changes that gear-heads have gone on about, like the missing F9 during boot (8.1 is supopsed to fix some of that, but Win8 sure ain't a tablet OS.
Here's something your pre-Win8 pc won't do -
tap the WinKey and type the first letters of the program you're looking for. I almost never use Paint but needed it the other day. WinKey + "PA" and boom, there it was
or
WinKey + "X" (at the same time) brings up an advanced menu with all sorts things like device manager, power management, Task manager, command prompt, a whole mess of stuff.
I'm willing to bet now that in 5 years all computers will be touchscreen