I don't want to confuse the issue for the poster, but I disagree with you madmouse - very much depends on the counsellor or psychotherapist's training and on their particular orientation. Sorry to sound nit picking but you say that "psycotherapy looks at how you have developed from early childhood onwards and explains" any difficulties you face out of that " etc. Psycotherapists of the psycho-dynamic orientation make interepretation from what you are saying and the word that you are using, and yes, they oare of the view that our difficulties as adults are often echos of what happened to us in childhood. Sometimes the interpretations don't fit and so there is no explanation* to be had.
I have spent 18 months in the past seeing a psychological counsellor who used exactly the same method, as her orientation was psycho-dynamic therapy (and there are several differing kinds of these) She also focussed very much on attachment issues arising from our earliest days, but she didn;t have the qualification to call herself a psychotherapist, although she did have a doctorate.
When you say "counselling starts from current issues etc" I wonder if you are thinking of CBT - I am concerned about your wording "helps you think through them and put them behind you." Any decent psychotherapist/psychologist counsellor will know that it is unrealistic that we "put things behind us" - this is unrealistic. I think the most we can hope for is for difficult things in our past to be made more manageable and less painful.
I do of course know your back story Madmouse and know that you have been helped by particular methods of counselling/psycotherapy.
I am seeing an NHS psychological counsellor and we are very much focussing on the way in which our behaviour and way of functioning is related to our childhood issues. We discussed differing theories this morning and she talked of using "person centred" theory and transactional analysis. It isn't as black and white as you paint it.
I am firmly of the view that the most important thing is that we feel comfortable and safe with the therapist/counsellor, many of whom don't rely on one theory but can "dip into" different theories dependent upon the needs of the client.