It has changed my life, well at least my Christmas. Almost everyone is getting a gift that I learned how to make on Pinterest; mostly with crap I already had laying around my house. I'm not going to go as far as claim I'm saving the world, one craft at a time, but I might be thinking it. Plus I'm a cheapskate and I love giving gifts that look like you spent a lot of time and money on them, but didn't really.
If you haven't tried Pinterest, go get a timer and set it for an hour and explore. You will be amazed at how quickly that hour is gone and how many times you reset the timer.
Don't say I didn't warn you.