You got lucky, because the rules state that anytime someone enters a park requiring the finger scans for the first time, they are supposed to check ID, then set the finger scan.
If the finger scan malfunctions later in the year, the CM is supposed to check ID.
If you enter a park, exit and then enter a park within an hour, then the CM is supposed to check ID. (This happens quite frequently when folks on the monorail resorts walk through Epcot to get to the Studios, or when folks at the Epcot resorts walk through Epcot to get to the MK).
So although you may have gotten in the first time, if your finger scan ever messes up and you get a CM that sticks with the policies, your cheap pass may be confiscated.
Carol