Seriously, I've worked at companies where everyone loved whiteboards, and I've been doing this work for almost two decades, but doubt I've seen more than 100 total lines of even pseudocode written on whiteboards, outside lectures or interviews. I doubt I've written more than a dozen such lines myself (again, barring interviews). Maybe some places work very differently from what I'm used to? TV shows and movies, even ones that are relatively down-to-Earth (Silicon Valley) love having programmers write code on whiteboards, so maybe that is how lots of us operate, I've just managed to never be around that kind of culture, somehow.

[EDIT] of course there are other, practical reasons a show or movie might have their characters do that, but I'm just offering the possibility that that more closely reflects common programmer experience than what I've seen first-hand does.

How old are you?