Convenience of a folding bicycle

If you ask me what is it so great about folding bicycles as compared to normal bicycles, here it is:

In fact, two of such bicycles can be folded and stored within the boot of a mid-size sedan (not even MPV or SUV), one on each side of the boot.

What I practically do is to store my bicycle and also squeeze in my son's 14-inch kid bicycle, and we can go to a park to ride our bicycles. This is done without installing any bicycle rack at the back of my car.