Thats a perfect technique for cooking a steak - my mother-in-law is an executive chef in France and she *always* uses the thumb and forefinger test to get steaks right... and she really does.
The only thing I would say different is to try good quality, aged, rib-eye - which to me always tastes a little nicer than fillet because of the fat marbled through it - unhealthier yes, but a special taste.