We were on free dining last September, so the 18% REALLY didn't bother me. We did not see a "decrease" in service due to the fact that the server knew what they would be getting, or due to the fact we were on the DDP. In fact, I believed the servers were trying extra hard to provide outstanding service, so the gratuity would go up! We did carry extra cash, and at each table service meal we left an extra gratuity. We experienced superior service at O'Hanas (Dinner), at CRT (dinner), and at the Princess Storybook Dininig (lunch).