In my day job as a technical writer, I use Windows; it’s really not been a great experience, but that’s a subject for another day.
There is one feature I LOVE, though: using the Windows + arrow keys to arrange windows around the desktop. Till now, I haven’t found a good alternative on the Mac.
But today I found @spectacleapp, and it’s wonderful so far! Free, open-source, customizable, maintained. Check it out here.