Agree with PP. You're not the rude one. It's such a 'huge" time saver, yet she's already taking the (longer) task of handwriting the thank you card itself. It doesn't take that long to write out the address too. And, I'm sorry, but writing thank you notes to 50 people makes her a special snowflake? I had about that many thank you notes to write for my wedding gifts, and I don't remember it taking me that much longer to do, especially since I spaced them out over the course of two weeks.
Also lol at the poster who talked about sending e-vites and thank you e-mails. lol
I also second the observation of BabyCenter being all sunshine and moonbeams no matter how ridiculous the idea. I remember researching (out of curiousity) just how many people I could find on messageboards that thought throwing your own shower was ok, and- surprise, surprise!- most of BabyCenter is in agreement that there's nothing wrong with it. SMH.