Quickscoping is a joke, it doesn't apply on PC games. The QuiKsCoPiNg was introduced in FPS in consoles, because most games tended to adjust the sight for you once you used the scope, so you could simply quickscope to let the game aim for you.
So in the end quickscoping is for lazy people, not pros or noobs; stop making such a big fucking deal about it.
Or at least stop giving the trend such a big importance. :(