Realistically, adults don't need to test everyday. As long as you have (1) a routine, (2) a good understanding of how your body works, (3) awareness of high and low symptoms, a (4) good insulin regimen, and (5) an understanding of how much a insulin you typically need following a meal, you will be ok most of the time. It's good to keep the meter around for those times you aren't sure or can't tell. It's like a sixth sense.
Travis, I've had t1 for a while and I honestly don't know what the heck you are talking about. IMO, the best you can do with the "guess method" is taking a bit too much insulin, waiting until you feel low, and then eat. There aren't many of us with a rigid enough schedule to be able to stay between 80 and 100 by routine aline. Out of morbid curiosity, I wonder what your a1c actually is - given 3 tests a week and the 6th sense? Then again, maybe you're a fluke and can achieve great control by guessing and feelings... however, many people find they cannot.