I can tell you from personal experience - that on a computerized machine if you sew over a pin (really if you hit it) you take a chance (probably a good one) that you will knock your machine out of time. That means unless you have someone who can time your machine - it will be going to the shop!

I have pinned very seldom in ten years

I rarely pin. I do if I am easing around a curve, but if my seams nest I find that I don't need to pin. I like to hold the edges together and sew that way. They almost always match. Pinning takes too much time.
Sue

I use elmers glue instead of pinning.

I fight with quilting pins when I use them, so I try to use them as sparingly as I can.

I pin a lot and was just thinking about that today. I should try to let up a little. I would have more time to sew.

I pin a lot! And I sew over pins, but I use very thin pins that my machine "likes". I hate pleats and I hate cutting squares down to make them the correct size. So I pin. About the only time I don't pin is when I'm doing strip sewing.

I pin long sections and intersections. I have an older machine and no problem sewing over pins...Thank goodness!

I am very much a quilt novice, but in my limited experience I have found that too much pinning causes me as big problems as too little. Like others above have said, I now just pin where matching is important, especially on a long strip. I also find that nesting seams helps the fabric just kind of 'stick' without needing lots of pins, especially if I starch it well first.

I pin very little now that I have discovered elmers school glue. I use a little drop at seams that need to match. I set it with the iron and then stitch away. It is not gloppy and the machine goes right through it