I realized the other day as I was pinning a quilt to the leaders on my quilt machine I put the pins in my mouth. On the flip side of that, I suppose it is a bad habit that I don't pin except for large pieces with multiple matching points, like rows of blocks.
My MIL cuts and marks everything for anything she sews. I wing it. I cut out an entire garment but I rarely mark anything on it and never until I need it. On quilts I cut as I need it and I never mark anything.
I also just get rid of most things if I don't finish them up pretty quickly. I lose interest. I am better about quilting projects but I have sent a few of those off to NeverLand, too.