Not quite - evac stop goes to "home" or "settle" and the doors open, belts unlocks, and walkways lower. Audio comes on directing guests to leave.
E-stop the vehicle merely settles, the belts stay locked, and the walkways stay up (doors closed of course). Audio comes on instructing guests to wait for a host/hostess.
Flight Stop makes the vehicle settle, doors/belts stay locked (have to be manually overridden by operator), the walkways come down, and audio instructs guests to wait for a host/hostess.
Power Disconnect is a big silver button that immediately cuts power to the vehicle, haulting the motion. Only to be used in extreme emergencies when the vehicles has stopped responding to other commands.