@Markerrag -- you only get a tangle of wires if you are sloppy when setting up your computer. A little discipline and some twist or zip ties can make that clutter manageable. Still, the advent of wireless connectivity has made things a lot more convenient for a lot of people.
It has also made it possible to make desktop systems more mobile. Even if you are extremely organized, setting up a system with a bunch of cables running through it is a lot harder than simply plopping a box down, plugging in a monitor, plugging the system into a wall and getting down to business.