* I had to re-map certain keys on my keyboard just to get a usable # key/'real' British keyboard layout - it ultimately meant I had keys labelled as one thing that did another (thankfully I touch type)
* Pressing Apple + C or Apple + Z meant forcing my hand in to uncomfortable, unnatural positions - I prefer the spacing on a standard PC keyboard between Ctrl + C/etc
* Single button mouse - ew! First thing I did was buy another mouse.
* Navigating with the keyboard was all but impossible in many apps because the tab did nothing, or didn't behave in a logical way. Same with backspace.
* I had constant problems with crashing. It was an old G5 IIRC but my older VAIO laptop performed better.
These were just some of the things that annoyed me and reduced my productivity daily. Asking me for reasons why I wouldn't buy a Mac of my own would be another list on top of that, hehe. Anyway, I knew I was doing the right thing getting a PC in when my boss complemented my increased speed at my next annual review.
Don't get me wrong, I'm a strong believer in picking something that suits your own needs/requirements. If someone thinks that a Mac is the better option, more power to them... I just don't like the stereotype that standard PC users are awaiting some sort of holy intervention from the God of Macs.
Huh? I'm pretty platform agnostic, but I've always liked this about the Mac. The Command key can be held down my shifting my thumb to the left of the spacebar and I can copy+paste without ever pulling my hands off the home row. Trying to hold control with my pinky and twist around to hit various key combos always felt more like a contortionist act to me.