You know what the sure fire way for me to get even busier at work is?
Book a vacation.
Then referrals and clients start coming out of the woodwork. I only have time to see one new client before I go and have just referred the 3rd one yesterday.
Sometimes the missed business bothers me but if I focus on it, I would never go away and that's not an option.
The flip side is the extra craziness leading up to my departure which does a more than adequate job of exhausting me and making a vacation sudden necessity.
I can empathize with those who feel dread at vacation time in anticipation of the amount of work they will come back to.