What the experiment implies (assuming it applies to a broader range of decisions than just those in the experiment) is that the act of getting on the elevator,

What the experiment implies (assuming it applies to a broader range of decisions than just those in the experiment) is that the act of getting on the elevator, reading the names, and pushing the correct button is mostly done on unconscious autopilot following the conscious decision to go to your doctor's, despite the illusion that you are consciously reasoning about each step. Likewise, Burger King purchases are unlikely to require conscious thought: you probably already knew what you were in the mood for when you entered the Burger King, and you certainly had a good idea what was on the menu before seeing it. Matching your known desires with the available choices (also largely known) was an automated process that didn't involve a conscious decision.