Many promotions happen because the person was already performing and showing up as being at the next level. Depending on the company, the Director role marks a clearer line between individual contributor roles and management roles. However, unless the promotion is accompanied by a significant change in scope or new formal reporting lines into the role, perhaps the most surprising thing is that much else remains the same. You might now be on some additional distribution lists for Directors and above, but most of that is also related to people-management.