No one types addresses now because it's so hard  

Here's some use cases:

Billy calls home from college and asks mom for money and wants to give her his address
The Red Cross has a tv/radio ad and wants to give a donation address

Basically any time you need to communicate an address through a medium that doesn't have copy nad paste (phone, TV, radio, billboards, in person)

Also useful because when you go back to look at your history you can tell who the money went to.