My son have a dx of AS and I wouldn't have said that his dx has been any help to me at all.
Maybe I am still burying my head in the sand but the consultant paediatric clinical psych. said he had social comms. problems but not badly enough to warrant a dx of AS. However, the review panel gave him his AS dx, despite none of them, except us as his parents and his SENCO from school, ever having met him! The OT wasn't there and I would say his symtoms are more dyspraxia related anyway.
When I speak to the OT, who is the only professional I met now, she just says labels don't matter. I am not sure if this means that she does or she doesn't think he has AS.
The only help the psychs gave us was a load of leaflets for the NAS and really the children they describe bear very little resemblence to my DS.
Thankfully, the school were giving DS some one to one time even before the dx and so the dx has made very little difference to them and he is getting the help he needs.
However, I can't help wondering if there is perhaps more we can be doing for his social comms skills but I have no way of knowing what is available as nobody seems to want to talk about that, just the very real and more pressing problems he has with his motor skills.
In answer to your question, no the dx was of no help to me as a parent but I suspect it was a great help to the psychs as it meant that they can close his file and not bother with him any more - not their problem. It was of very little help to the school as they were helping already and he was already on the SN register.