My team is more than half remote. We almost never plan software on whiteboards because collaboration is tough. But we do use them a lot for logistics, which tend to be dominated by the in-office folks.
Thanks. Our team is also remote, so we don't use whiteboards for collaboration. It seems like, at least here in SF, every room in any company that I go to has a whiteboard. One might then conclude they are indispensable, but I would really like to figure out how to put a number on it.