I also do what you do sometimes. It comes in very handy when drawing concept sketches and it's a terrific way also to draw. But for when I do full illustrations I have to start with the stick figure as more often than not it's usualy a pose i've never done before. Plus it helps when you want to make the figure lean or bend a certain way.
My approach on poses is to close my eyes for a minute and try to visualize something, If that doesn't work I just try to follow were the lines lead me. It is probably wiser to sketch it out first but I have a problem sketching. I draw to dark and cant erase. even when I start of light I forget half way through and indent the paper. Just a limiting personal flaw.
To each his own my friend. I have always been a firm believer in the old saying that if it's not broke then don't fix it! So all I have to say is that if it works for you then don't change it as after looking at the amazing pieces you come out with I sure wouldn't.