I suppose I’m one of the lucky ones . . . about 2-3 weeks after diagnosis, my insulin requirements started dropping (I was set at 10U Lantus 2x daily and 10U Humalog before meals) to the point that, after even one unit of Humalog was dropping me low (in the 60s, but with symptoms of hypoglycemia), I stopped taking the humalog and have been bouncing around 2-3U of Lantus at night. I’ve been keeping it pretty low carb and trying to exercise, which seems to help matter, though the Jewish holidays are kicking my butt in that regard 
Of course, every time I see a “high” number (you know, like 130 2 hours post, or a 118 fasting when I have a cold), I start to worry about it. It’s more the psychological impact of it than the actual impact - even if I was running 130 2 hours post and 120 fastings permanently, it wouldn’t affect treatment at all!
I agree, however, with the low carb/“good carb” recommendation - I found that a bowl of Kashi cereal for breakfast, salad and chicken or meat for lunch, and a high protein dinner (perhaps with sweet potato fries) worked pretty well. I try to avoid going over 30g of actual carbs a meal - discounting fiber, sugar alcohols, etc. Since I’m not calculating for insulin dosage, I figure the “net carbs” method is good enough, especially since this is all a crapshoot anyway.
You’ll also want to look at the glycemic index of the carbs you do eat. It does suck significantly, but it also, at least for me, seemed to keep things in much better control.
The other thing, as Gerri pointed out, is to check your insulin’s age. I find that, toward the end of a pen’s life, the insulin seems to get weaker. Perhaps that effect is more noticeable on small amounts, but it’s a consideration. Which, come to think of it, probably explains why I just had to go up to 3U from 2 . . . .
