Ok, so, I went hunting. I found an article on the decline of the Holiness movement in general;
The Holiness Movement: Dead or Alive?
and within it, found this;
"I am not yearning for the past. I believe the holiness movement, in many cases, had an abusive past. But in trying to correct these abuses, we overreacted.
Some (perhaps most) in the old holiness movement were legalistic and judgmental. So we became behavioral libertarians. Some were so ingrown as to never touch the world. So we became assimilated into the world and seldom touched God.
Some were radically emotional, running the aisles, shouting, and "getting blessed." So we became orderly and respectable, and we labeled all such emotion as "leaning charismatic." Some were judgmental and rejecting of anyone who got divorced or had marriage problems. We became so accepting of divorce that it is quickly becoming a non-issue for all but the clergy—and even that is eroding. They preached a fearsome, vengeful God. Now we have a soft, easygoing Mister Rogers in the sky, "who loves you just the way you are."
~~~
Ok. So it sounds like a feature of some of the old-school Holiness worship involved shows of emotionalism and the kind of behavior that one might associate with some Pentecostals. This might be what I was seeing and hearing.
This sounds like it ties in to possible Holiness ideas concerning how the Holy Spirit works, and what signs a believer has that He is active in their lives.