While no one can pass judgment on the joy of another, your question about the psychology of being saved brings to my mind the difference between euphoric pleasure, a more carnal enjoyment, and true joy, a more spiritual fulfillment. Dancing and singing and holding hands and flat out revelry are, in my opinion, attempts to “force” spiritual joy by indulging the body in ways that approach carnal passion. Very opposite the seasonally appropriate Catholic means of fasting and denial, and solemn prayer.
Since joy is a foretaste of heaven, it must (in my opinion) be distinguished from pleasure that is and can be illicitly forced. Again, no judgment on others’ ways of happiness–lest I condemn half the world and myself in the same breath.
But really, such a psychology is likely to stem from either a life of prior excessive indulgence in vices and numbness to the focused joy of the indwelling spirit, the Holy Spirit; or else stems from prior deprivation of true love, which would have united a person to form a family before involvement in such a group. Either way, as some of the thread responses indicate, it is better that Jesus’ Church, which in Paul’s gospel is “all things to all people,” is the one for whose sake these people are attempting to force the spirit into their hearts. True, Catholics know from our mass that “equality with God was not something to be grasped” (Philippians 2:6): but yet, there is a kind of warmth in what some of these folks, zealously uninstructed in the way “letting go”, will try to do to attain or grasp equality with God. In my opinion, it is not much different than when another kind of psychologist says “It’s all about self esteem, loving yourself, having self (confidence), etc.”
When confronted with such situations, I might consciously meditate on the Acts of the Apostles. In that book of true friendship, of the earliest church it was said: “But if it be of God, you cannot overthrow it, lest perhaps you be found even to fight against God. And they consented to him.” (Acts 5:39).
It has been difficult for me to accept the divisions of the church and thus the idea of salvation outside our given Rite; but the reality seems to be, there are many cases where it is possible with the help of our prayers.