are there any "cool" new features on the Note5 that I missed?

I don't know. What are the ones you HAVEN'T missed?:D

(edit: oops! Beaten to that zippy reply. LOL)

The new feature I use most often that seems among the least talked about: double-click on the home key to open the camera, even when the phone is locked. (Works on the edge 6+ too.) It's startling how fast it opens, ready to shoot. I've never seen anything like it.
 
Triple tap home for one handed operation (Shrinks screen down into one corner or the other)