I started to journal about 3 months ago when my anxiety and depression started to get out of control. Sometimes I will go back and read the previous day or two to reflect on things, but that is it. Some of the stuff I wrote, especially at the beginning are too painful to go back and re-read now.
I use a site called Penzu. My whole purpose for journaling is to get things out and to release my anxiety, not necessarily for documenting my life, although I do go back and reflect on some of the stuff I write. Most of the time I don't re-read any of it.