As long as it can be turned off I think it's fine actually. I have it on my hybrid daily driver and there are a few long lights on my way to/from work and I'm perfectly happy to not have my car sit there burning gas for no reason. Even in stop and go traffic it doesn't really bother me.
I guess it annoys some people, but in most cases it's harmless at worst and saves a few bucks and a little bit of gas at best.
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