Like feline fanatic and Cabbagepatch. Maybe a little less on the Pfaff (dual feed) -- I can do a full-length drapery sized seam with no pins, and can manage areas that need just a little easing. It's a good thing, because that dual feed hates sewing over a pin LOL.
On the Singers, I pin rather more. They don't care if you sew over a pin although every now and then I forget to take them out, hit one dead on and the needle breaks.