Absolutely! 
And THIS is why we leave the car in gear @BMBabeMy Merc has Auto hand brake, i think it is great, much better than my Volvo before with manual hand brake.
My wife parked the Volvo at her sisters house went in for 3/4 of an hour, on returning to the car she was putting my nephew in to the back car started rolling down the hill.
They were all ok , bit shaken, but this was the result.
All came off our insurance
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There's a story here .........And THIS is why we leave the car in gear @BMBabe