As a generally keyboard-centric user I've found OS X to be awful. Inconsistent behaviour when using Cmd+Tab (which switches to most recently used app) versus Cmd+` (which cycles through app windows instead) is frustrating to say the least. Finder is vastly inferior to Windows Explorer and I find myself dropping into the shell way too much just to do simple file management tasks (cut and paste anyone?). Being unable to tile, snap or maximise windows is also rather frustrating; yes, you can fullscreen an app and yes, you can drag and drop another window onto a fullscreen app [in El Capitan] to tile them side by side but that's so clunky it's almost a joke when on Windows I can hold down the Win key and use the arrow keys to snap windows to the screen edges.
I could go on, but I'll stop there...
I was asking because disabling Windows Update (which someone has corrected me, this tool does not do) seems more extreme than switching to a different OS.