Please see the articles and studies in my profile. Complete resolution of type 2 diabetes IS possible with surgery - they are even conducting studies as we speak on surgery as a treatment for type 2 diabetes in patients who are not even overweight (with promising results).
And it's not just diet controlled. I invite you to the DS board to ask of those who have been cured by their surgery - they are out there. "Cured" as in they can eat freely, including sugar, and not have an abnormally high blood glucose spike. "Cured" as in off all meds, including insulin, and maintaining an A1C in the low 5s (some even in the 4s) at 10+ years out from their surgery.
I agree that still checking your glucose levels occasionally even after off meds is something you should continue to do as a means of monitoring, but as for your statement about having to watch your weight and food intake for the rest of your life, I respectfully disagree (even if to also point out that not all type 2 diabetics have ever even been overweight - excess weight is not a requirement for diabetes, and there are numerous studies that show that surgery can resolve the diabetes even without much weight loss).