Scott,
As one of your subordinate questions you asked, "What happened?", meaning, I assume, "what actually happened when you experienced vital worship?"
The surface answer seems fairly simple. I believe the Holy Spirit penetrated the walls I build (boredom, anger, dryness, fatigue, cynicism, etc.) for a moment and I was swept up into a more--what--vital?, powerful? experiential? form of worship.
Sometimes I envy our Pentecostal brothers and sisters for their abandon in worship. I am such a classic Presbyterian. I am buttoned-down in worship. Though many in our congregation wear collarless shirts, we are still somewhat starchy, if you catch my meaning.
But then I think, does "vital worship" require an ecstatic, external manifestation? Surely Calvin would have said no, and if I had time this morning I would look up some quote from the Institutes to support my point and impress you with my erudition! But my understanding of Calvin's personal spirituality, and dim memories of passages on the nature of God lead me to feel he had a very vital faith, while at the same time calling for order in worship.
Are you hoping that a focus on vital worship will reveal some way, some path that buttoned-down Christians can follow which fits their personal and corporate styles, yet also offers a more "known" Spirit?
mr