I've been a Mac user since 1992, shortly after my daughter was accepted by MIT and wanted one for use there, and I looked it over and used it, and thought, "I gotta get myself one of those ..."
In the years since, I've known a lot of people who have to use Wintel at work, and bought Wintel for home use, mostly for compatibility or familiarity.
And, I've known a lot of people who use Wintel at work, because they have to, and are Mac at home, because they know compatibility is not that much of an issue. And they gripe about Windows, a lot.
My daughter only commutes to her office two days a week, and telecommutes the other three days, and says her home Mac runs what she needs to run faster thru her office Wintel, than the office Wintel runs it when she's in the office.
In my own experience, the student next door spent a lot of time on my Mac, and finally talked the parents into getting a computer. Despite my advice, and offer to help with the cost, as an "early" grad present for the student, and the student's own pleas, they went with cost and got an Acer. I still had the kid from next door on my Mac, a lot. A science project assignment came up, and the kid did all the work on the Acer. When it came time to print, the printer wouldn't work. I tried everything I could come up with, but it was no go. So, we copied all the files onto CD, and brought them over to my Mac, opened the files, imported them and published the whole thing. I gave the Acer files back, along with a CD of the files as the Mac finally saved them, and said, "Try to even open those files on your Acer."
But, I don't know of anyone who uses Mac at work and is Wintel at home. If you're familiar with Mac, Wintel just doesn't cut it ...