I've been meaning to start a journal (will start now), but I've been using Daytum obsessively for the last year and a half.
At this point I have over 24K+ data points about my life including what I've done, consumed, people I've seen and the good and bad things that have happened to me. It can be a pain to keep up sometimes, but I have a hunch that the data becomes more valuable as time goes on.