I meet a LOT of people in my real life circles. I'm always collecting names and phone numbers, usually on little scraps of paper, and later transcribing them into Contacts. Quite the chore, too! When I heard that the Note 3 can read my handwriting and enter my handwritten (with the S-pen) names and numbers directly into Contacts, I was DONE. Sold. Hurry up and take my money!
All the other stuff it can do, like scrapbooking and stuff, I will likely come to love as well... I foresee heavy use of the S-pen functionality.