The final inspection (CO) is more cursory than anything else as by then its all closed up.
Each of the inspections along the way Plumbing, Electrical, Mechanical, Life Safety are all the real ones before you can close up the drywall/ ceiling. The "Final" inspection by the Fire dept makes sure there are no obstructions, that you have all the life safety operational, the building dept makes sure you dont have any code violations. Usually both are fairly quick if youve got yourself in the right place.