Directly answering the OP's question; I absolutely feel that knowing I have high functioning autism, has been a GREAT HELP in getting ahead in life. I can see the point about maybe using it as an excuse for not trying hard, but when you use it as a tool to see things ahead of time and plan to handle them, or when you know you've done something that's extra-difficult for one of us, it's the best feeling. An analogy would be to compare it to driving somewhere, and you know you have a flawed map in hand because somehow it always gets you to the wrong place, no matter how carefully you study it. If you don't know what's flawed about the map; such as you don't know whether the flaw is wrong street names, or wrong distances, etc., you have no clue where to give some extra attention to avoid being steered wrong... Wouldn't it be better to know that the map is flawed by knowing that all distances on the map are short or long by exactly 30%, but most likely the problem is not wrong street names?
Knowing about my autism, makes me much more able to know when there's one of those social situations headed for the dumps, and I can do something about it ahead of time, before it all winds up in a huge trainwreck of a misunderstanding.
In addition to that, I spent my childhood hiding my special interests, or denying them to myself, as I hated being teased and called a lunatic for such things as wanting to listen to air raid sirens, or needing to stand and watch the trash truck driver operating the trash compactor, or when I was around 10 years old, dragging home dozens of old TV sets to keep and fool around with. All these things while other kids were playing baseball and riding skateboards; neither of which I had the remotest interest in. Trust me, I feel much more comfortable as a productive, respected autistic adult than being "that weird nut" that I would likely be, if I didn't know myself.
Charles