Of course I have. And that has merits, until the system does not do what it's intended to do. If it just costs you $5 in overages, you might be content to say "Well, it would cost me $20 to park all day in a regular parking lot. I'll just get juiced up and pay an extra $5 to park!". The point of the stalls is to conveniently charge an electric vehicle, not to have reduced price parking.
I don't own one yet, so I've never been in a situation where I needed a charge but I couldn't because I was blocked in by a non-charging Tesla, or one that had completed its charge an hour before. But I can say that if I know that there's no way I'll get back to the car to move it in 5 minutes because I'm still eating or the checkout line is too long or whatever, and if I know there are no additional charged to be made after that 5 minute grace window, I will not be hurrying to get out to get it moved. I've already paid the money and if there are no further consequences for me, then I'll continue to enjoy my meal.