I moved from Linux to Mac OS X back in the days of OS X 10.1. I bought myself a PowerMacintosh G3 (Beige desktop) when I was in college on ebay and thus begun my Apple fanboydom (as an aside, spell check wants me to change 'fanboydom' to 'bondwoman').
Over the years, as my income increased, I began buying myself brand new Macs from Apple - A PowerMac G4, A PowerMac G5, various PowerBook/Macbooks and finally iMacs. My experience with my 27" iMac finally did it for me. I had, against my better judgement, bought an all-in-one because the Mac Pro was just too dang expensive.
I quickly learned the hard way that all-in-ones are NOT user-serviceable. Power supply go bad? No, you can't slap another one in your tower, you get to lug your big iMac into an Apple Store, walk past all of the hipsters fondling their iDevices, and up to the "genius" bar and leave it there for a week. A week during which, btw, you're not getting any work done. I was so mad, I blogged: http://jamesadam.me/blog/why-im-switching-from-mac-to-linux/
So, the hardware situation, combined with the whole iOSification thing you mentioned, has driven me back into the clammy arms of the penguin. I tried a handful of distributions, and finally settled on Xubuntu, because I hate Gnome 3.