Lotsa times.
No, I’ve never been healed by one. And neither has anyone else I’ve ever known, though we’ve had eleventy billion faith healers through my old church in the 15 years I attended.
There was one that I remember distinctly that thought himself some kind of Jesus Psychic. He’d call people up one by one and “prophesy” their ailments, then pray for them. It was nice and easy when they were, say, wearing hearing aids. Anyone else he called “low blood anemic”, and said “you probably haven’t heard it from your doctor, but you’re tired a lot, and that means low blood”. Yeah. Raise your hand if you’re tired! Congratulations, you’re all anemic. ^_^
The same guy loved to pray for the girls in the youth group (12 to 24 years old). He put his hands on one girl and said something along the lines of “You need to stop worrying when that man is going to come into your life! Focus on GAAAAHD ALMIGHTY!” Then she turned her hand around so he could see her wedding ring, and pointed to her hugely pregnant belly. I about died laughing.