Writing code on a whiteboard like it's a test or a competition, without being able to sit down in my editor of choice and calmly think it through and trial and error.

Programming is not sports. I'm not a coding athlete. Maybe it is for some people, but not for me. That's not what the job I've held for all this time has ever been about.

Plus you get to a certain age and experience and the thought of "proving myself" to some 25 year old is just... Really?