Not so. There are two different kinds of speaking in tongues. 1 Corinthians 13:1 says we can speak with the tongues of man or of angels.
The tongues of men is speaking of known languages such as what took place on the Day of Pentecost (Acts 2:4-6). This is the gift to supernaturally speak a known language without having been taught it, and it comes for the purpose of witnessing, as on the Day of Pentecost.
There is also a gift of tongues that is speaking in a heavenly language (what 1 Corinthians 13:1 calls the tongues of angels). This is a language that is not known to the speaker (1 Corinthians 14:2 and 14) but allows the believer to communicate directly with the Lord through the Spirit. There is another kind of speaking in tongues that equals prophecy if it is interpreted (1 Corinthians 14:5).
Not every believer will speak in known languages, as on the Day of Pentecost, or prophesy in the assembly through a message in tongues and an interpretation (1 Corinthians 12:30), but every believer who receives the baptism of the Holy Ghost can speak in the tongues that are for the purpose of edification (1 Corinthians 14:4).
"He that speaks in an unknown tongue edifies himself; but he that prophesies edifies the church. I would that you all spoke with tongues but rather that you prophesied: for greater is he that prophesies than he that speaks with tongues, except he interpret, that the church may receive edifying. 6ow, brothers, if I come to you speaking with tongues, what shall I profit you, except I shall speak to you either by revelation, or by knowledge, or by prophesying, or by doctrine?"
It's a bit of self righteousness to say they don't need a sign, it's that GOD GIVES a sign. They don't have to receive what He gives. IT doesn't mean they aren't saved. Speaking in tongues is still a supernatural gift to every believer who will receive it.
And, of course every believer is baptized in the Holy Spirit. It is just the fringe groups of believers who think this is the repetitious chanting they claim.