My own understanding of the value is it can make the sub blush and that can be lovely (as long as the sub isn't distressed). And I've heard quite a few subs admit they get off on being called nasty things (bitch and worse), or even spat at - it's quite often used in chat on this site between play partners. Maybe such name-calling is what you refer to as mild - but as far as I understand if it goes beyond that point (e.g. to where a sub may start devaluing themselves as a result) that's degradation not humiliation - quite different.
I think others may have a much wider definition of bdsm humiliation which goes far beyond the verbal, so once again it's a question of finding out exactly what someone means if they mention humiliation to you.
Hoping this helps
VV
[edit] And I'm sure you must have come across Delia's artwork http://www.bdsmlibrary.com/forums/sh...or-Humiliation which gives far more information [/edit]