As soon as you return from the developer's with those new photos next time, take the time to sit down and label each photo with names, dates, and locations. Reading one is like taking a trip back in time to live their lives with them. You get to experience their fears, joys, hardships, and love in every word they wrote.
Many people do.
Maybe it is a way of recording private thoughts you never want anyone to read. It is to give your children and their children the opportunity to see your life through your eyes. It is the ability to show your descendants the accomplishments and mistakes you made, in hopes they will learn from them.