Earlier quoted context omitted.
Yes but it's been steadily declining. I guess I should have added an asterisk and said "Amongst power users/developers" since those are almost exclusively Mac now (from my observation, YMMV)
I imagine you are living in a Mac bubble. On our main building, which has four floors, there are exactly 4 Macs. On two of the customers sites I visit regularly, with several hundred people on the respective buildings, only iOS developers have Macs, and they aren't that many on site.
Now in London, Tokyo, Chicago, Austin, Seattle, Toronto or New York it's probably more balanced, but I see plenty of tech companies that are Mac standard.
I work for a global software and services company of over 2500 people and I'd say maybe 5% are running PCs with windows or Linux, the rest are on Macs. (And we aren't specialist iOS developers).
I'm not sure what the share is in Salesforce, Amazon, Google or Facebook or the like, probably over 30% at least.