Used it 3 or 4 times today.
On 2 phone calls I need to jot down a phone number, take some notes and write down an email address.
I also entered a new address directly into Google Maps. Once I verified it was a good address, I tried to long press the address field to copy the area and save it into a contact. But, apparently Google Maps won't let you copy from this field (why???)
So I took out the S Pen, clicked the Smart Select, then selected only the address on the screen. I hovered the S Pen over the selected screen clipping, waited briefly for the "T" to display and was able to copy the text this way.
A nice little work around to keep me from needing to retype the whole street address again.