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The advantage isn't the time saved, it's that you can erase the need to charge your car from your mind. You just don't need to think about it any more.

Also, the flexibility of the thing hints to me that it will be used for charging more than just cars in the future.

I don't have a Tesla. But if I did, and I had to remember to get out, walk around to the back and plug it in every time I got home, I would probably want one of these in my garage!

Given average driving habits, the range of the Model S and the charging speed of the Model S, the back of my napkin suggests you'd only really need to plug it in once or twice a week. So forgetting occasionally doesn't sound like a huge bummer.

This enables a self driving car to charge. Your car can drop you off and go park.