If you want to try to use less lines in your gesture drawings. I would reccomend sketching with a ball-point pen instead of a pencil when you do your gesture drawings.
From my experience, using a pen made me consider more my lines and proportions as well. Since with a ball-point pen, you aren't able to erase your mistakes which you can use the information where you notice the mistake in your art to redo the drawing closer to the correct proportions.
Don't be at all afraid to make mistakes in your sketches. The more comfortable you are with the medium you are working with, the better it is in the long run with improving your linework.
Hope that helps!
