I agree, Patrick is rude.
And he makes at least a few large assumptions, which are:
a) rolling your car back and forth will reduce or eliminate the flat spots, since it's highly likely that your Cobra will end up at rest in the exact same spot,
2) the garage door has to be opened and closed, unless you have a Garage Mahal, but first the cars in front of the garage have to be moved in order to get a little rolling distance, the emergency brake has to be released and and reset, so we're talking about a 30-60 minute job, and
ii) if you have a polished aluminum body, then there's another 30 minutes to several hours of re-polishing the areas where you put your oily hands.