stupid question because I have not touched a Mac since 1999. What kind of apps are you using on Mac that if you were forced to switch to Linux you feel that you can't live without?
the appeal back then (and from I hear people say until today) was always how everything is neatly integrated. a coherent system from the hardware all the way up the stack. not sure if that is overselling it but at least that's how I understand is what people are happy to pay for.
I live and die by my IRC Client, Textual [0]. It may seem like a simple thing, but I've tried all the clients on both Windows and Linux and haven't found a suitable replacement.