I think everyone's situation is different... I'm pregnant, and keeping a close eye on my numbers is extremely important for my heath, and my baby's. Too much glucose in the blood stream will affect my placenta and my son.
I do tend to get obsessive, and my husband often gets frustrated, because - let's be honest - glucometers aren't all that accurate. I can test within minutes and my number will be 20-50pts different. That's why I have two glucometers

I need to know as soon as possible if my numbers are out of control, so we can take measures to protect my baby.
My doctor isn't as strict about my numbers as I am. He knows they can vary and looks at the whole picture, which is good. I know other moms who have a couple fasting numbers in the 90s (the rest are under 90) and their doc's immediately put them on meds/insulin.
But yeah, I get obsessive, I don't want another 11lb baby