I pin a lot...curves, easing, long seams, matching seams, matching points, registration marks, lots of things. It improves my accuracy greatly and is well worth the extra bit of time it takes because most of what I do is fairly detailed work. I pull the pins before the needle gets to them and I usually manage to pin so only the very tip would go under the needle in case I misjudge my timing. I do not sew at full speed so maybe that helps, too.