I use my NFC tags with NFC Task Launcher (which I got for free from Google Play, but others say it is a paid app) to do the following:
1. Bedside table: 1st touch turns off Sync, Notification volume to 0, Alarm volume to max, Brightness down very low - 2nd touch restores all those settings. I tried to get it to turn off the LED light for notifications as well but it doesn't work, it seems Samsung messed with the LED and it won't work on the S3.
2. At work: 1st touch turns volumes down to 0, vibrate off, brightness low, connects to work Wifi, disables mobile data, launches Any.do so I can see my to-do list. 2nd touch turns volumes back up, brightness to auto for when I go outside, enables mobile data and sends an SMS to let family know I'm on the way home.
3. In the car: 1st touch turns notification and media volume up, turns Wifi off, puts phone in Car Mode. It needs to be in car mode to trigger a Tasker profile I set up which mimics the S3s Driving Mode, since NFC Task Launcher can't toggle Driving Mode. 2nd touch turns media and notification volume down, toggles media playback and turns Car Mode off.