I did do a few blocks once. (I have a book with quite a few patterns in it and instructions, plus I've downloaded a lot of PP patterns.) I have a "directional" problem, which means I have a tendency to get things upside down and backwards. With that problem, I think it is much easier to make errors when paper piecing. On the other hand, for sharp points (like Mariner's Compass), I agree that PP is really useful.