It doesn't matter if scrolling up and down makes sense to someone or not...the fact is that millions (I don't know...maybe billions by now seeing how touchscreen smartphone far far far outpace PCs) of folks are quite used to side scrolling to get to apps. I don't see any great advance in this emperor's new clothes interface myself, but I'm not gonna dog anyone that does. I've said this before, but if this advancement is so great for pure tablet use, please explain to me why I need to "see" the taskbar when I've got a metro app open and I'm in "tablet mode"? Does it provide me some great productivity boost to be able to press the redundant "start" button? Maybe it assists in developing finger dexterity as I try to bring up the hidden taskbar items lurking behind the up arrow? I know...it helps me to quickly switch between the apps that I already have a nice swipe left gesture for? Anyway...I'm sure you get my drift. Look...is Win10 some sort of great shakes for keyboard and mouse guy/gal? I think it certainly is. But don't blow smoke up my exit chute telling me it's some kinda major advancement from a pure touch/tablet perspective. Slightly incremental in some ways...slightly regressive in others...that's what it is.
And about the corporate world embracing Win10...well of course they'll jump on it. Like the majority of them have a real choice other than to do just that. They've almost all made their normal cycle skip, so many are against the wall to upgrade whether they would like to or not. Plus, it's no secret that the majority of changes here were developed with their wishes in mind. Long term, I don't know if it even matters. Anyone with half a brain cell can see the writing on the wall for general computing in the future. Even with the "bounce-back" expected for PCs this year, they will still continue to lose ground to other pure tablets and smartphones in all likelihood. We're in a generational shift and with retirement/old age/death coming to those hanging on soon enough...change will be in the wind quickly with the next generation of decision makers who could most likely care less since they've had an entirely different life experience of growing with technology than those that will be on their way out the door.