You dont do that PPL cessna training for nothing, and i believe back to the basics is sometimes very rewarding. Take for example a triple IRS faiure. I want to know i can rely on those instruments before i have to use them, and im sure F/O would agree. Its good airmanship to stay one step ahead of the aircraft, for safety precautions predominantly, and if that triple IRS arises after that check on the ground, you are to rely on 'luck', which im sure you all would agree is not a first choice when flying. Certainly not my first!
G.Khan, i would like to back you up on what you said about JFK's taxiways, and that you would prefer your FO to keep his eyes out. I 'spose you have to gamble abit between what chance there is of using the instruments and weather to check them or not.