PCness in general is bad...
Why would a woman feel disempowered if I say "mailman"!? (well I see why but geez... grow a spine) You can get in serious trouble in some academic environments for using such "disempowering" language.
I think that terms like "recruitment" and "new member" are there because of groups like NIC and NPC that think changing the name of something will change what that something is. At the same time they changed policies regarding rush and the new member period they also gave new names. Are the new names critical to the success of the new concepts? Probably not.. I doubt we'll ever get to find out though