I have never, not once written on a whiteboard at work.
Then you are a loser and I don't want to hire you. Your attitude sucks.
I've been using whiteboards all my professional life. I have to use them to explain ideas to others, and have others explain them to me. If you can't express a simple idea of, say, implementing an in-order linked list insertion, then you're useless for my team. How can I expect you to explain the complicated algorithm you are working on? How can I expect you to give an informal talk about your latest work to the team? How can I expect you to socialize ideas that you have to other engineers if you can't whiteboard them?
When I ask candidates to code for me, it shows me how they think. I don't care about all the ; being in the right place, or if you misspell strtok strtoken. I care about how you can clearly explain what you are doing and walk me through your thought processes. If you don't know, say so. If you don't know and try to BS me in the interview, you'll try to BS me when I ask why your code is late or broken. The whiteboard programming for me is more about how they approach things, how they think through them, how they test the code to make sure it is right, how they weed out bugs, how they respond to my "what if someone passed in NULL here?" etc. They don't need all the answers right, but they do need to demonstrate they can think on their feet and take the right sorts of approaches to things.
And besides, you'd be surprised how many people can't write simple in-order insertion code. Or reverse this list. Or count the number of 'w' that are in a string passed in. Or, well, you get the idea. While I like to have "hard" questions, I rarely get to them because these simple ones catch up so many people so badly that I end things early. I make things hard because I want to judge you on a scale of 1 to infinity. When people complained about a calculus teacher giving really hard tests, he responded "well, I don't want to make them too easy. After all, everybody in this room is taller than this pencil, but it doesn't tell me anything useful about them if that's my the only metric."