I grew up using both Macs and PCs in my late teens. In those days, the Windows "blue screen of death" was a common occurrence. Not only did the Mac "just work", but it had a beautifully-designed UI with literally a whole book of user interface guidelines for developers to follow, to ensure applications work consistently. You spend less time swearing at the machine because it just does what you expect.
That was in the days of System 6. At System 7, the Mac became just as unreliable as the PC, and I abandoned it.
Meanwhile Windows was getting better but still rubbish. I remember one of my expert sysadmin colleagues being pleased that the company had upgraded the RAM in his Windows NT workstation, as it meant he only had to reboot it once a week instead of once every 2-3 days.
Once I discovered Linux which "just worked", I jumped in. When OSX came along, I knew I would eventually be tempted back to Mac. I made the shift when I was in an environment which required me to share Powerpoint and Word documents. (Libreoffice was, and still is, useless for editing Powerpoint without corrupting it)
The fact that Macbooks have good hardware design is a minor issue for me. It's entirely about the OS. If I could run OSX on a normal PC, I would. (I know it's possible, but I can't be bothered with "Hackintosh" and mucking around with compiling kernels and the like).
Given the way OSX is going with forcing your data into the cloud without your permission, I can see myself swinging back to Linux at some point.
But one thing is for sure: I'm not tolerating Windows ever again. Occasionally I'm forced to touch it and if it weren't for Google it would be completely unusable. Example: tried resizing a PowerShell window? Thought you could just drag the corner of the window? Think again. Oh yes, you have to right-click on the icon in top left hand corner, then select "Properties", then select the "Layout" tab, and under the "Window size" heading edit a text box which gives the width, then click "OK". Obvious. These people have no CLUE about user interface design.
Finally, I thought this comment from the article was illuminating:
"scientists tend to operate in environments where they have a freer choice regarding the selection of their computers, and the result is Mac usage that is disproportionately high when compared to your average enterprise"
Put it another way: many/most people would prefer a Mac if they had the choice. More simply again: many/most people hate Windows.
Could this also explain why Windows phones and tablets have such a tiny market share? The name "Windows" chimes with everyone as meaning "horrible user experience"