I use two features all the time, the screen write. I'll give you four uses that I use it for.
1. to draw stupid **** on pictures I took.
2. To circle, make a pointing arrow to a specific part of a picture I took for easy reference to the receiver.
3. illustrations, Say you want to add a waterfall to your pool, take a picture of your pool, draw a waterfall to the height and width you want. Use this for any explanation, addition, alteration to your house without beating yourself over the head trying to explain it.
4. Taking Notes is always faster by pen. Lets say you have no paper, on the phone and the person is trying to read you the address by which you need to send something. You could open a note app and have them slowly give you the address and spelling of the name or you could write down the address in real time.
4.+ The ability of the note program to read your crappy hand writing and put that name, phone number and address into a contact automatically is pretty amazing.
I wish I could draw cause I would draw a lot if I could.