I was raised on Macs (well, actually, I was raised on X-Acto knives, but let’s fast-forward a bit). But I learned Windows in self-defense many years ago. At first, it was a bit foreign (we’re talking Windows 3), but not painful. After all, it’s not as if Microsoft hasn’t, ah, emulated the Mac interface.
Why did I do this? So that I could handle customers’ PC files when they came into the printing plant. We had quickly learned that it wasn’t smart to try to move the files to the Mac: fonts didn’t translate, text reflowed, and things generally fell apart. It made more sense to keep the jobs in their native habitat.