Sushe, that’s not what many poskim say. Your weight being in or not in the elevator does not cause it to go or stop, as it stops at every floor. Your intention is not to cause more electricity to be used, it is just a possible unintentional side effect (is that what we call a p’sik reisha, btw?). When you pour water into a cup from a kettle that has been on the blech, does the water that remains in the kettle not heat up even more (because there is less volume in the kettle now)? But you would not say that is assur to make a cup of hot tea on Shabbos,would you?
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