I confess i love pp for a lot of projects - and have started my DGD on it...and she really likes it too. I know i would never in this life be able to put together some of the compass or other skinny points i've made with PP if i tried to do it with regular piecing. But when i first started using it - i did feel like i wasted a lot of fabric - and very often i would cut the shapes i wanted backward so that when i stitched they fell short. But over time it seems my brain adjusted and now i feel very good about not having much waste - and i very rarely (won't say never) cut the pieces backward....I think it just takes time for your brain to start seeing things "backwards" since you are working from the wrong side.
ALSO ---- you are taking the error very graciously - cuz i confess if i got a PP pattern and did all that work just to find it was wrong - i'd be pretty upset