Thank you letters after interview?

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I did and am planning to continue to write handwritten. Given to the admissions office upon leaving, I think it's a little more personal than e-mail.

Here you go Mr/Ms/Mrs/Dr X, here is my handwritten thank you card to Mr/Ms/Mrs/Dr. Y that I wrote prior to even meeting any of you. I hope you will remember my kind gesture because I sincerely wrote this general thank you in bulk for whoever is involved in the admissions process.
 
Here you go Mr/Ms/Mrs/Dr X, here is my handwritten thank you card to Mr/Ms/Mrs/Dr. Y that I wrote prior to even meeting any of you. I hope you will remember my kind gesture because I sincerely wrote this general thank you in bulk for whoever is involved in the admissions process.
I don't think it's so bad if you write a short, quick personal note in the lobby before leaving that day. Definitely don't recommend writing it beforehand.