As you have previously stated...this WAS, past tense, a an understood and 'known' language heard by those of other dialect present at the time, and in their language spoken....it was not some sort of heavenly gibbirish as is claimed today rather distinctly spoken and understood.
Also it was indeed 'a sign' to the "UN-BELIEVING Jewish nation present. Who famously sought such manifestations out of the ordinary in the times of which they lived.
Unfortunately we are living in a time now where people are purposely seeking the "feel good" and mystical "experiences" as the stage is being set for what is to come. Many are wired now to expect some form of "proof" and base their faith not on Christ alone but on that which they feel and the expereinces which often are simply a matter of hypnotic trances and or by their own desires manufacture the happenings within their brains...as New Agers do in their out of the body "expereinces".
The frightening part of this movement and others like it is the physical affects can and do lead to some becoming very imbalanced mentally....and damaged emotionally. It becomes an addiction to have and experience the next "High" and used to "take them away" from an otherwise unfulfilled life perhaps otherwise.
If you note at many of these churches who practice this behavior...little is spent on actually study of the scriptures outside of those picked to undergerd and support their happenings...and why they will usually always refer to the Corinthian chapters and verse...or knit-pick scripture from other areas to twist into those verses. They waste no time in their services on scripture otherwise and those used are often used to excite and stimulate the people along in order to set the stage for the 'experiences' and out of control behaviour they do enjoy and look forward to thereafter.
It's all staged and focused on getting to the place where their so called "Holy Spirit" manifestations, by and via their so called "anointed" leader occur. When in fact it is by another spirit I believe this behavior is being promoted and certainly in no way represents the Holy Spirit of God.
We're ALL anointed. Every believer has the same Holy Spirit as any other believer.
The followers of the Charismatic movement have become such big time respecters of persons, contrary to the clear teaching of Scripture.