Wow, you might even manage to wind someone up at this rate.
I really hate it when I can out type a processor,

in truth there are so many other real life occurrences that make any computer task take longer than it should. Most of them are genuine and don't sound like Mac hating (i saw a mac in a store once)(and it made me feel stupid, so I stood next to a dell and spied the mac from a distance) rubbish.
I would like to know these applications that take so much power, or the Mac machines you have experience of.
I just don't believe any person is really capable of taking advantage of scientifically measured performance differences, real life just doesn't work like that.
Are you rendering a HD animated movie on your Fujitsu-Siemens S6120?
here are three reasons for using a Windows PC over any other Personal Computer.
1. you want to run really high FPS on the latest PC only games.
2. Going with what you know/ avoiding what you don't want to know/ you were given a (new) PC for free.
3. you have an invested interest in the Windows based PC being perceived as the only choice in consumer level computer technology.
Usable computer performance is basically a measure of how a machine can be utillised to organise a persons workflow in a time efficient manner.
Use anything you like to achieve this...
I use both platforms and I know I am a nicer person when I use my Mac all day, I really genuinely get angry when I have to play the Windows game and people do know when I've been playing the windows game. However, on my Mac, I don't waste energy fighting and put more energy into my workflow.
My mac is my friend and we like to make each other happy.