Two things stand out.
One is obvious: they no longer have their physical affliction.
The second is that most folks who are healed (not all) become quite spiritual thereafter.
They think they've been touched by God, and they believe and become more faithful.
Even folks who go on pilgrimage there who are NOT healed generally report a renewed faith (not everybody).
There have been studies done on this. It is very interesting. The place seems to really refresh and renew people's faith, whether they're healed or not.
I've heard the same said of many of those who've gone through near death experiences. I think God knows our hearts better than we know them ourselves, so the real healings that have taken place have less to do with physical wellness & more to do with people seeing their natural human doubts removed.
They think they've been touched by God, and they believe and become more faithful.
I'd use the phrase "firm believers" where you used the term "faithful" & I think all of us are touched by God.
Even folks who go on pilgrimage there who are NOT healed generally report a renewed faith (not everybody).
I see some healings you don't seem to recognize...