Hawken said:
Willing subjects don't get saving throws, Will or otherwise. That's why they're called willing subjects.
No, there are two different things going on.
"Some spells restrict you to willing targets only. Declaring yourself as a willing target is something that can be done at any time (even if you’re flat-footed or it isn’t your turn). Unconscious creatures are automatically considered willing, but a character who is conscious but immobile or helpless (such as one who is bound, cowering, grappling, paralyzed, pinned, or stunned) is not automatically willing."
"Voluntarily Giving up a Saving Throw: A creature can voluntarily forego a saving throw and willingly accept a spell’s result. Even a character with a special resistance to magic can suppress this quality."
"(harmless): The spell is usually beneficial, not harmful, but a targeted creature can attempt a saving throw if it desires."
An unconscious character is automatically a willing target, but does not automatically voluntarily give up a saving throw.
Thus, you can automatically Levitate an unconscious creature, since they are willing, and the spell does not allow a save.
You can automatically use a Cure Light Wounds on an unconscious creature, since it is (harmless), and thus the save only applies if they choose to attempt it... and since they're unconscious, that's not a choice available to them.
You
can't automatically Enlarge an unconscious creature, because it's not (harmless), and unless they voluntarily forego the save, it applies. Even though they're a willing creature, that's separate to voluntarily giving up a saving throw.
-Hyp.