Yup, its the level design curse!.. And it wasnt actually to difficult. Rather, learning and as a result, dying. Only to be met with the same cutscene and not being put right back into the action was the downfall. By the time you get back into the action, you forget what killed you. Only to repeat the same mistake.. Or have something else get you.. Now that was the infuriating part. But your right, knowing all the traps and play testing it a million times does cloud your judgement.