OSX's Spotlight (and, admittedly, Win7's clone version of it) is a much faster way of launching apps than clicking giant widgetized icons. If I want to run outlook, for example, I hit command-space, type the first two characters, and hit enter. I don't move my hands from the keyboard at all.
THAT kind of productivity is what I like. I liked it in the old versions of the MS toolbars (before motherfucking Ribbon), because I had shitloads of common keyboard shortcuts down. If I was sending an email, and wanted to insert my signature it was alt-I/S/D (Insert, Sig, Default). In apps like Notepad, where Ctrl-S wasn't available for quick-save, Alt-F/S would do it. Etc, etc.
If I have to move the mouse around, it just takes time. It sounds silly, but it adds up, and breaks the rhythm of whatever it is you're doing. I don't want to have to hunt around for wherever M$ decides to "organize" the new features - I just want them quickly accessible and out of the way otherwise. I've run Office 2011 for a year now and I still for the life of me can never find the digitally sign/encrypt options when I look for them, because MS decided that Print and Attach A Picture!! were things that people in businesses would use more than encryption and PKI. It's fucking stupid.
The PC/Tablet hybrid thing is just not going to work. It's a neat idea, they should roll out a full fledged Microsoft iPad ripoff and put this on it. It'd probably be pretty cool if I could run any Windows app on it, especially the mapping software and shit that I use for work.
I don't need a weather widget that takes up 10% of my desktop, or a stock widget. Or a list of recently used shit in case I want to save time by clicking a shortcut to a file I edited 3 hours ago. Make it clean and efficient, and I will use the shit out of it. That's why I run OSX now. It's not perfect, but it's a fuckload better than any alternative.