Re: Not my experience
Zealots are the ones who could just as easily use any tool for their work, yet insist that only a Mac is suitable, and insist that everyone else's valid choice is wrong because it's not a Mac. That, as you point out, doesn't apply to scientists - here, OSX has some considerable advantages over Windows, but ironically, the biggest advantage is supplied by Microsoft.
The ideal scientific researcher's system is a "Unix that runs Microsoft Office". The first bit seems obvious, but the second will be a surprise if you've never worked in academic research. There's no point in finding stuff out if you don't share that information with other researchers, so that means lots of paper writing, conferences and presentations. Hence, MS Office, particularly Word and PowerPoint. (Personally, I've always preferred TeX for paper submissions, but a surprising amount of journals now either accept or actually prefer .doc files).
But brand-loyalty has always struck me as one of the more depressing aspects of human psychology. I'd always describe my computer use as being "someone who owns a Mac" rather than "a Mac user" - the former term doesn't try to define me as a person.
I sometimes have great difficulty in understanding how someone can become so invested in what is only an inanimate possession that they'll waste their life in unpaid defence of the honour of whatever multi-billion-dollar corporation makes it. Camaraderie with other users or lovers of the same products is fine, but unless you're actually paid by Apple/Google/Microsoft, quit working for them for free: they sure won't be sending any flowers to your funeral.