Imho, most managers also do fantastically boring administrative scut work —- think various aspects of hiring, scheduling, budgets, progress reports, personnel reviews, handling administrative complaints (EEO, sexual harassment, etc.), recruiting, etc. Maybe some things are a bit different than a CC dean, but the genre of work is similar.
The specific differences in your perception may revolve around whether the manager/dean has a trusted admin, and whether that admin is around.
Just a guess...
What do you think managers do?