well, uhm, to go back on topic...erp....
For three years of therapy I was misdiagnosed, or more accurately incompletely diagnosed, with major depressive disorder. In fact it was the therapist who was 'blind' if a bit inexperienced. It wasn't until a friend who knew an Aspie pointed out things to me that I suspected that I might have this. Lo and behold, within a year it was clear I had Asperger's and was diagnosed as such.
As much as NTs, even well meaning professionals, think they understand, I don't think they could fully comprehend our situation. For those years prior to me even knowing what Asperger's was, I would describe my inability to decipher cues from others in social situations, how I felt this impenetrable wall in my psyche many times when dealing with people. So I'd always be baffled and frustrated that my therapist didn't understand what was happening with me.
Once I knew and understood Asperger's, it was like the sighted leading the sighted, contrary to your premise. So many things became clear, and my depression lessened a great deal.