Ditto to what Snoot said. You young guys need to start one. It's cool to go back and look at what you caught somewhere and what on from 10 years back.
Something I think that is really important,,,especially in the fall/winter, is logging the lake level. I know if I had a successful trip on some brush and the lake was @ 960 and I log that,,,,then I know 5 years later if I am on the same lake and it is @ 960,,,I will going to that same brush.
Just my .02 cents worth.
J