I wouldn't write off homeopathic treatments but, as someone else said, I prefer the term "complementary" since I see them as perhaps useful in some circumstances or as an addition to "conventional" medicine.
However, I have a degree of scepticism about over-reliance on both homeopathic and conventional drugs. I think many people are encouraged to be too passive in dealing with various health problems. I saw it with my Dad. He would have a whole line of different tablets to take each morning for all sorts of ailments, including depression, and I feel he was not encouraged to look at ways in which he could assist towards his own health and happiness - e.g. by watching his diet more carefully, keeping more active, etc.
Also, I believe I'm right in saying that research has shown that the "placebo effect" can be demonstrated in those that take conventional, as well as homeopathic, drugs.
I think treatments like Reiki, reflexology, head massage, do work for some people, perhaps partly because they induce a state of deep relaxation. Also the people who are attracted to doing these therapies usually have a genuine commitment to relieving suffering and a great belief that their treatments will be of benefit - a belief that may well be communicated to the client. I think any treatments (including "talking therapies") that focus intensively and compassionately on a person in distress can bring relief.
I have found that some people who practice Reiki do so for no payment or for voluntary contributions because their prime motivation is to help people.