Just thinking is not enough, you also have to be attentive. Yet another essential skill is to hear and see what is really there and not what your mind tricks you into seeing.
Yea, but you wont buy a Mac just to run Omnifocus. You can probably find alternatives on other platforms or in the cloud that are just as good or better.
I'm talking about killer applications, where the overall experience on mac is magnitudes better than anywhere else.