That does suck, but as mentioned before, it can be mostly avoided if your careful enough, BUT it's not 100%! As long as it didn't chip or crack the paint, paintless dent repair is the way to go
Out of the three dings/dents mine had in it's first two+ years, two were definitely avoidable! The first one was when I was looking at the driver side view mirror not to run over my ramps and tools and totally forgot my dad's Miata was parked where my Stang usually sits. Thinking that there was no car there I never checked the passenger side mirror until...*bump*

That left a couple big paint chips on the bumper and put two creases in the quarter panel! The second instance wasn't my fault at all... I was sitting in the right lane on the highway in bumper to bumper traffic when I hear a loud thud on the passenger side of the car! I asked my son, in the back seat, if he heard it and he said yes, so I knew I wasn't just hearing things... I looked behind me and the car wasn't close enough to have been the one to hit me. I pulled over to the side of the road, got out and saw there were two nickel sized deep dents on the quarter panel... This was along side a stretch of woods and I suspect that kids must have thrown something and my Stang was the unfortunate victim. I saw nobody when I looked in that direction. Hopped back in the car steaming mad

So now the passenger side quarter panel is really messed up

The third was when I was traveling down the interstate and a piece of plywood was kicked up by a pickup truck in front of me (didn't come off the truck). I saw it tumbling through the air and I slowed down (couldn't move over as there was traffic to my right and to the other side was the jersey wall on a bridge), but it wasn't enough and it caught the front lip of the hood

All in all, no matter how careful you are, there are other circumstances that can arise and ruin your day and your Stang's appearance if you take it out for a drive. As mentioned before, it's not a
"real" problem and money
can fix it!