Practice Plan

Just spent most of the evening drawing up various practice plans on 6x4 cards. Really unsure as to the ultimate purpose of this- is it to aid improvement or is it in fact a way to feel like I'm working at golf, even though I'm not, a bit like those entire evenings spent drawing up incredibly elaborate study plans that I knew would never be followed? Time, and scores will tel, although I'm a bit concerned that the use of three different ink colours indicates at least a touch of the latter...