How is it complicated? Click Start menu, then dropdown next to shutdown and select switch user. Or hit Crt Alt Del and select Switch user. Same number of steps as in XP or Vista.
I think when they went from horses to cars they had the same issue. Before they just hop on and yell "Hiyaa" and off they went. Now there is this KEY thing...
You know this explains the odd looks I got when I got a flat tire and shot my car 6 times.