Daas Yochid: Al I know is “puk mo amo diber”. There are numerous Shabbos elevators throughout the world, in hotels, in hospitals ,etc…- accepted and used by tens of thousands of jews.
So, whatever Possek you may quote , it is accepted that one can use it. You are welcome to any chumro you may wish but the klal does not have to accept it. And, you still have not given any logical reason why escalators, that run continually, should not be used. And, by the way, the fact that -maybe- more energy is used when there are more people does not make it ossur. Opening an closing your front door on Shabbos makes the heating work harder. Opening and closing the door of a refrigerator -even when the motor is running-will make the motor go longer. Just living in a house or apartment will make the boiler or the air conditioner work harder. Extra energy is not a measure of what is ossur or muttar.