I have no idea what half this means.
Does this mean that, with 8, I will need to know what type of thing I am wanting to run to know where to look for it? Why? Can't I just run a thing?
If you use Modern UI apps (Apps designed for Win8, are generally full-screen, and not windows on the desktop), the running ones will be listed in their own taskbar that slides out of the side of the screen. They won't be on the standard Desktop taskbar.
But, of course, standard desktop apps will be on the standard taskbar, and not on the Modern UI side bar.
Desktop users might not have to worry about that, so much, because you will probably stick with Desktop apps, anyway. You'll might only venture into Modern UI ones on occasion.
But, if you are using a Tablet machine, you
DO, sometimes, need to know where to look for open apps. You might find yourself switching between Modern UI ones and Desktop ones, and not having them on the same taskbar becomes a hassle:
For example, if you are using a couple of Modern UI apps and an Office application at the same time.
Though, you can keep
one Modern UI app in a split window, if you don't mind the real estate being limited by that.
Most people can probably put up with that, for a while, but the extra little cognitive load is really unnecessary. It's just a sign of bad design.