I'm a big fan of Hue and as a person with ADD, it has certainly changed my life.
I get visual cues that snap me into a routine I set for myself, sometimes without even noticing it. For example, when I'm supposed to be working, my lights are a bright white which helps me stay focused. When it's time to put down my work and unwind, my lights go a deep blue and I get the feeling to relax. When it's time to eat (people with ADD can forget to eat believe it or not), my kitchen spotlights light up my counter.
Other useful functions, fit in the Internet of Things category. Every morning, I step on to my Withings scale. It keeps track of my weight and if I'm falling below the target weight my personal trainer set for me (I'm trying to gain weight), my kitchen LEDs will turn red and I know I need to do better at eating more calories.
Another one of the great uses is a tie in with my Calendar. If I have a high priority item coming up, one light near my desk will flash red. This could just mean it's time to leave to an important appointment or that an important project is soon due.
Finally, it's so nice to wake up to a glowing sunshine in your bedroom even though it may be gloomy and raining outside.
All that said, I'm lucky I live alone because when I have visitors, my whole system falls apart because nobody knows how to turn on the darn lights. So glad they finally brought out a switch.