Tribal Speak, I think you're thinking of the Fast Forward. The Fast Forward allows a team to skip remaining tasks and head to the pitstop. The express pass allows teams to skip a task only. All other tasks (including the U-turn station) must be completed.
Personally, I think Ernie and Cindy should have saved the Express pass for avoiding a loss rather than trying to gain a win. I'd save right up until the 8th leg if I didn't need it earlier. They'll probably be fine, but it's not something I'd do. And it didn't work out for them anyway.