This is a flawed analogy. Car engines don't need to run all the time. You turn off your car, then you turn it back on. A car engine's purpose isn't to constantly measure something and accurate display the measurement. It just produces energy when you need it to. An automatic watch movement that sits will stop working, and must be wound and reset to serve it's purpose.
Yes, it makes sense that the parts in a watch movement that runs less may last longer before wearing out than a watch that runs all the time. But watches are designed and intended to run all the time (or, at the very least, a lot of the time). What's the difference between a watch sitting on a winder or a watch being worn all day, every day? (other than the fact on the winder it never gets jostled, hit, dropped, shaken, etc.) Do people that fear wear from winders not own daily wear watches?