I use NFC all of the time to bump my kids to-dos in Any.Do. I also share web sites and sometimes pictures. It's been pretty useful to me but then again I'm on Android.

WiFi direct is pretty cool too. I use it to create a local LAN so the boy & I can play some LAN based team games while sitting in the car waiting for my daughter.

I have the Galaxy Note II and they both have Galaxy Nexuses. We leave all of the wireless stuff on all day long and never come up short on battery at the end of the day. Bluetooth, WiFi, NFC, etc.