Depending on how fast a T1 loses beta cells (or beta cell functionality) there need not always be a "honeymoon period". (Or it can be long past by the time they get diagnosed.
T2 involves insulin resistance. Which means that cells don't respond as they should to insulin. Thus a T2, even with impaired beta cell functionality, may be producing more insulin than a non diabetic. A strange quirk is that often fat cells do not become insulin resistant (or as insulin resistant) as other cells. Something which may have a lot to do with the association between T2 and obesity. Being unable to use most of the glucose in the diet for respiration it gets converted to fat. But a high blood glucose level, frequently topped up with dietary glucose, inhibits non glucose respiration. Only cells without mitochondria actually "need glucose". (Typically cells use glycolysis to produce pyruvic acid from glucose. The issue with the brain is that only sugars, ketones & alpha hydroxy acids can easily get into neurons.)