Good for you that using the timer has increased your skill level! That's a great benefit in having it!The 0-60 timer is hardly "useless" in a general all encompassing term. It may be useless for some individual drivers.
I have found it very useful, as it has helped me see which launching techniques produce the fastest times for my car.
In fact, the timer has done more to improve my times than any single mod I have done to the car-by far.
First 0-60s when the car was brand new we're 5.8s. Now they're down to 4.6x-4.8x with my fastest being 4.47, 4.50, 4.56