I don’t use it, so far; neither do I use an escalator, but I have no idea why. When there is more load there is more current, but so what? Since when is allowing an electron to pass an Issur? It does not fit the definition of the Issur of electricity as defined by the Chazon Ish, Reb Shlomo Zalman, or Reb Moshe. It can only work with the Shita of electricity being Hav’ara, which is long out the window.
Notice, that through all the generations there is not a mention of the sparks caused by taking off a sweater in dry weather. If causing electrons to flow would be an Issur, we wouldn’t be allowed to think. But hey, maybe that’s why we aren’t supposed to learn Be’iyun!
Had it been around B’yemei Chachomeinu perhaps they would have Assured it, because its usage usually includes pressing buttons; perhaps they wouldn’t, because people depend on it a lot; and perhaps they would only be Mattir a specially built one — that doesn’t have any controls.