I think watching live at the circuit and on TV are 2 totally different experiences.
There is an atmosphere at the circuit that you obviously don't get watching the tele but to really get to see the race in detail, tele is best especially on Sky who have developed their F1 coverage to an immense degree.
Of course back in the day the TV experience was fairly basic to say the least and on the other hand going to see the GP live was very much cheaper and you could get so much closer to the action.
Ahh, the good old days.