My son has type 1 diabetes and a glucose monitoring system was a complete game-changer for helping him manage his blood sugar. You should take a look at them, if you haven't already.
I have, or rather my doctor has. To date, Medicare doesn't cover them. Having had a lot to do with metrology in my career, I would certainly get one if I could afford it.
There's definitely a learning curve to managing the condition, balancing food intake vs. insulin dosage. I've been doing it for years now, and I'm holding my a1C in the low 6's, but it took a while. Continuous measurement would help a new sufferer a lot in climbing that curve.
I view it as being no different than the industrial process control that was a large part of my career. It's a fundamental principle there that more frequently you measure the better your control will be.