So until recently I was that annoying person who waited until the very last minute to RSVP. My reasoning was that something else might come up and I might find out I can't actually go, and it's better to RSVP right at the deadline than to change my RSVP.
Now that I understand the torture of waiting for those RSVPs to come in I have changed my ways. I will now RSVP promptly and if I say I'm attending I will do what I have to do be there and honor my obligation no matter what else comes up.
What about you guys- has wedding planning changed any of your bad habits?