There is no real substitute for learning how to throw a human being than actually throwing a human being.
So it comes down to reciprocity: I'll let YOU throw ME and you let ME throw YOU.
Falling technique is all about surviving your turn getting thrown.
And there ARE things that are learned about throwing by being thrown, as well.
I have to go with my peer on this one to a T. However I make my students do so many falling reps it is 2nd nature for them. If you are in Judo, Hapkido, any throwing art then well as my good ol dad would say "I have had a long career in hapkido because I can fall." He's been at it since 1973 and continues, so I guess there is truth in the saying.
Plus there are two variations of falling no matter what. 1. You hit the deck with one thud and recover, 2. The ground hits you. I don't recommend #2 at all.