I have a couple of things to say about this...
In Serbia, more specifically in Vojvodina (northern Serbian province) people used to greet each other with the exclamation "ljubim ruke" (i'm kissing hands) and they would go around and kiss every person's hand who is worthy of respece (ex. older people, women of any age, etc.). It was just a part of the culture to kiss each other's hands as a sign of respect.
In the one Coptic church i've ever been to during the "kiss of peace" in the liturgy the people went around exchanging the kiss of peace through their hands, not kissing on the cheek as i've seen in EO parishes.
I think that kissing any nun or monk's hands who is not ordained, an official abbot or elder is bad form, and bad for the monk/nun's spirituality and humility.
I also have a HUGE issue with any priest or bishop who doesn't let me or any other person kiss their hand. Arn't they conduits of the Holy Spirit? Don't they bless people every Liturgy from that hand? Yet the instant Liturgy ends, they can't bless people? How does THAT work?
Anyway...i have some personal issues with some of this stuff, so forgive my gruff response.