I think counsellors are a mixed bunch.....in my experience most of them seem to have problems with prejudice and with dominating, and with jumping to conclusions that follow their personal, pet therapy method. Even if you get a good one, they'll probably get changed for a bad one just when you thought you were getting somewhere.
The good ones have given me some useful insights - e.g. that a boring relationship I was in was boring because it had stopped developing, and not because there was anything intrinsically dull about the relationship. When I ranted about the behaviour of an ex, the counsellor said "there's got to be a reason why she's acting with such anger towards you." That set me thinking along the right path instead of just looking for support for my vitreol about the situation.
So overall I think it can be a good thing to have a "health professional" to talk to, when you're going through anything emotionally difficult......it does take some skill, and some people just can't counsel without bringing their own emotional baggage into the mix, but when it's done right, it helps you to consolidate your thoughts and make them more clear and real. I've always felt that it's a great shame we can't always depend on having friends to do all that for us, but even if we know such people, sometimes the subject matter is best reserved for somebody who isn't so involved in your life.
I think that counselling by email could work quite well for Aspies........it avoids the problems of working in realtime. I've heard it said that "talk" therapies don't work very well with Aspies.