I see whiteboarding as a skill that is very useful in presenting or defending design ideas. I've had several cases where I used a whiteboard to layout a design interactively to an audience in a design review. I find I am at my best when I have marker in hand as it gives me control of the conversation.
Yes, but that's a different application of white-boarding.
In the case you describe, you've already done the more "valuable" dev work of thoughtful analysis/design, and you are merely presenting that work.
That's far different from being forced to devise that design at the whiteboard, singlehandedly, with onlookers.
That's not to say that devs don't hash out designs collaboratively via whiteboard (yet a different application). That certainly happens and is useful. But, you're likely to find that--even in those situations--team members have considered the problem offline prior to the collaboration.
