I only pin at the corners for binding, usually. BUT my binding is probably the worst part of my quilt so maybe best to do the OPPOSITE of what I do!
I don't like doing the binding so I do it the easiest way I can think of. If it's a flannel backed quilt I just flip the excess over the edge to use that as binding. I figure it was good enough for my grandma so it's good enough for me! If I'm not doing the flip-around method I more or less mimic that method using homemade binding - I lay it right-side down on the back of the quilt and sew it on by machine, about a half-inch or so in. Then flip it around and fold & sew by machine to the front. If I do it right it lines up pretty well and looks like normal machine-stitched binding, but sometimes it wavers on the back side. BUT since it was all stitched down on the back to begin with the binding never comes off, it just doesn't look as perfect as when it lines up.
I don't pin in either case, except to hold corner folds (I fold it so it looks mitered). It works better and goes faster if I just hold the fabric in place, sew a foot or so, fold and grip a new length, sew...fold....sew... etc.
I also never press my binding; to me the creases make it harder to line it up right. It seems more forgiving if it's just a flat strip of fabric.