I don't know what type of experience you've had with tongues. I will tell my own:
when I got "saved" or whatever we should call it, people told me that I should start speaking in tongues. Not immediately, but at some point during prayer in the following months it seemed that my tongue was "loosed." Obviously I don't know what I said, and maybe that doesn't matter, although some would say that understanding is better than just speaking.
I have seen many many people also pray in this manner, where no one else knows what they are saying.
What happened in Acts seems different to me: one person spoke, and 20 people of different countries all heard that one person speak in their own language! We could call it, "the end of Babylon."
Yes, maybe it was not only "supernatural tongues" but also "supernatural hearing!"
This is how I read Acts 2, and I see it very different from what I see in churches today.
Clearly, there was (at least one) purpose in the Acts 2 experience--- that of evangelizing. What we see in churches today, however, doesn't convince me.
Just like the fact that preaching back then looks to be very different than your average Joe Blow Preacher on a shoebox on Main Street. Or Benny Hinn. Or.......
After all, back then, they didn't even have a New Testament!!!!!!
These days, I feel the Lord drawing me higher in Him through the Psalms. I asked the guy at the bookstore if they had a "pocket Psalms edition" and he looked at me pretty weird.
But the message of Christ is as old as time, if we can see it...