The most annoying change in Windows 8 is that the user has to constantly switch between two worlds. Even if you are in a desktop app, you have to switch to the Start screen if you want to start another application or to search for a document, because these features are available only from the Metro world. Although I’m trying to hypnotize myself, that the Start screen is nothing more than a huge Start menu or the desktop with giant icons, this change is confusing.
Windows 8.1 brings great improvements to this issue. Really. For example, if you press the Windows+S hotkey while in the desktop, it shows the Search charm in an overlay:
No more switching and no more taskbar with tons of launcher icons.