My experience was a little different because I had major hormonal changes (pregnancy) that affected my BG levels and insulin sensitivity. I was diagnosed in April 2016, got pregnant in August, and went from no insulin therapy to both long and rapid acting by February. Delivered baby at the end of April, and my insulin needs immediately decreased to the point where I only needed rapid acting for simple carb/sugar heavy things. Since that time, I’ve seen a gradual increase in my need for insulin. I added long acting again this past November, but I’m still on a very low dose (4u).
I have found this to be true for me, up to a point. I started out very carefully carb counting, nailed down my ICR for different times of day, etc, but now I primarily dose by “feel” - what I think I need based on past experiences and kind of an eyeball of about how many carbs are in the portion I’m eating. There are a lot of foods I eat (like fruit) that have always required more than my ICR even when I was closely tracking, or foods that require me to split my bolus (dosing once before eating and then again an hour or two later, due to fat content causing a 2nd rise). I keep my BG between 70-140 most days, with occasional excursions up to 160-180 that I’m able to bring down very quickly. It does help that I use Afrezza for any meals that are truly unknown, because you don’t have to carb count at all with that, really.
I have found, despite the increased need for insulin, managing my BG hasn’t gotten particularly more challenging in the past few years. Sure, it can be annoying if I don’t dose enough or I dose a little too much and have to deal with a high or low, but again, even those are mild (highs barely hit 200, lows in 50-60s), so compared to most, I’m still doing really well.
Oh, and that reminds me - I used to have occasional reactive hypos after I was initially placed on insulin therapy, where I would dose insulin, eat, go high, and then an hour or so later, my pancreas would belatedly spurt out some insulin which, combined with a correction dose, would end up sending me low. It never happened consistently, so it was hard to predict and very frustrating. I don’t have that issue much anymore, so I do think that’s a sign of disease progression - that my pancreas no longer feels up to joining the fight.