As far as many is concerned and why we see few healings - one reason may be our failure to do what Jesus did which was to only do what we see our Father doing. We automatically follow formulas and while they may be Biblical (lay hands, anoint with oil, pray, rebuke sickness), there were times when the Father led Jesus to do other things like make spitty mud pies, send lepers to the priest, and other things we might think weird or strange.
We may be following formulas rather than spending time in intimate relationship with Father God (I am endeavoring to do more of that with Him). We may also fail to fast more often. We westerners love our food. We also may be lacking the compassion that Jesus had. Jesus genuinely LOVED the people He healed. Sometimes we want God to heal through us so that we can have something to brag about. It is not always genuine compassion that wants to see people relieved of their suffering.
Finally, I hear more of supernatural healings taking place outside of Europe and the USA. Perhaps there is a desperation in poorer countries than what you find in more materially prosperous nations. Poorer countries can't go to a minister and say, "pray for me" while secretly saying to themselves, "If this doesn't work my health insurance can cover the surgery I'll need and the medicine I can get." These people have no choice BUT to rely on God for a miracle. Even many of the poorest Americans can go to the free clinic and get some drugs and a shot in the butt.