When Walt Disney World’s Magic Kingdom opened one Friday morning in April, Nicole Gardenier, her husband and their 13-year-old son rushed to Seven Dwarfs Mine Train and boarded the roller coaster within 10 minutes. They hit 16 rides and attractions that day, including Space Mountain at 11:05 a.m., Big Thunder Mountain Railroad at 12:05 p.m., lunch at the Crystal Palace at 1:15 and a 2:10 Splash Mountain soaking.