I lost my mental focus sometimes when worrying about numbers on a paper. Might be something I'll have to get used to.
I guess if you have a better memory than me you might get by, but with my memory, forget it!
aranoid: I was thinking that also, if you reach an advanced stage it might not be as much of a big deal because your weights won't change fast.
However, for me, only being 5 months into it, I just change things around too much to remember them yet. Maybe you could just do it once a month or so to at least have a good record of what you do incase life throws you a curveball and you miss some training. I keep all of my logs in a folder just incase.