Marc Malkin Senior Film Awards, Events & Lifestyle EditorPatrick Dempsey has left the “Grey’s Anatomy” building…again!While the actor appeared on last week’s episode when Meredith (Ellen Pompeo) dreams of her and Derek finally having their wedding on a beach, it sounds like that was the last of McDreamy popping up on the ABC drama series.“I thought it was a beautiful way to close it,” Dempsey says. “The intention was to really give people some hope because they are such an iconic couple.