When the iPhone was first introduced, Steve Jobs told us it brought together three things: the iPod, the phone, and the internet. Today this is kind of funny because we don't really think of the iPod as a thing, and we hate talking on the phone.
Today I would say the iPhone brings together the following three things: messaging, the internet, and a camera. The camera part is huge. iPhone cameras aren't perfect, but they get better every year. Even if you use a DSLR, you still immediately interface it with your cloud photo storage.
Our pictures are at our fingertips, and it's been a change. Now our personal challenge to figure out how we organize our photo collection appropriately for all of our devices. At the end of the day though, we have great pictures, and we can see them all the time.