I don't speak in tongues (my "private prayer language" is English), but it's fairly evident that there is greater support in scripture for the validity of tongues than not. The non-tongues denominations believe it has "ceased," but they base that upon a half a verse in I Corinthians.
I'm also convinced from my observations of the Conservative Baptist church that they pooh-pooh tongues, and other manifestations, not simply from scripture, as they'll contend, but from their exprience: their leaders have never experienced tongues and the like, so they are inclined not to consider it a valid gift for today. Hence, experience does play a large part in how many in the traditional, conservative evangelical churches view these things, despite the fact that they speak against basing one's theology upon experience.