Professional and hobby photographers alike work hard - to learn their equipment, go out of their way, wake up early for just the right lighting - to get that perfect shot. But in real life, whether you're a professional or an amateur, moments are going to happen that go by too fast to capture with the camera.
For example, I was just walking through a park area when I saw two cute little girls with their parents. I thought the parents were going to take a picture of their girls but, next thing I know, the parents are on their knees in the grass, posing, while this tiny 2- or 3-year-old girl stands a few feet away with the camera in her hands. I didn't know if they would appreciate a stranger taking their picture, but it was just too adorable to pass up. I turned on my camera. Alas, before I could raise it up to frame the scene, the moment had passed and the parents were hugging the little girl and looking into their camera to see how she did.
While I didn't capture that moment on film, did you notice what I did? You just read it - I journaled about it. While I love having pictures, because each one has so much information in it (a "thousand words") that can jog my memory, it's the memory that makes it special. Whether you blog on the computer or write longhand in a journal or in a scrapbook, you can capture those special moments.
That's what I love about traditional scrapbooking: when I don't have pictures I can put tickets, brochures or even a sticker on the page, and then write words next to it to explain that special moment.