What my husband calls "the drawings of a mad-woman" I call "Project Sketches." The sketch above is for some fabric-dollhouses I'm about to make for gifts using UK Lass's tutorial. Whenever I start a project (any kind of craft) I find that I have to sketch it out in order for the project to make sense in my brain.
I'm also working on finishing up my first attempt at a knit sweater (Rosamund's Cardigan); I can follow any knitting pattern much better if I sketch it out ahead of time (visual representation of the text). The project sketch below is of the sleeves (long sleeves are not detailed in the pattern, I sketched out the sleeves- as below- before I started to knit them).