I'm terrible at sending cards, and I find it a nuisance. What's worse though, is that my mum gets cards and she has NO idea who the people are. She may have met them once, or be related to them, but if they sign the card with their first names only it's hard to guess. She gets a few like that every year.
I go through the ritual, but only because it's generally done. But awkward situations sometimes come up. Should I send a Christmas or birthday card this year to my lately ex-sister-in-law? At what point should a Christmas card to my brother also be addressed to his new partner?
We did get one christmas card last year that said that they would not be sending cards this year, but would be making a donation to a charity (I think it was for MS) instead. Sounds good to me! We did that in work too - everyone gave a couple of pounds and we gave it all to a charity instead of giving out cards.