Jude, in his brief epistle, says that we build up our faith by praying in the Spirit. The Apostle Paul said in his letter to the Romans that the Spirit is able to pray that which we can't find the words to utter. The phrase: "praying in the Spirit" is just another way to describe tongues, which are incomprehensible speech inspired by the Spirit. Clearly, the Bible highlights the benefits to the believer of praying in the Spirit, and I see no possible downside to speaking with other tongues when the scriptures testify to the upside.
Of course, what really matters is what Jesus wants for us. He told the first believers to wait until they were baptized in the Spirit before going off and trying to fulfill the Great Commission. They waited, were baptized in the Holy Spirit, spoke in tongues as a result, and then proceeded to go out and turn the world upside down. Why would anyone expect a different pattern for those who came after them? Certainly, only really bad interpretation musters 1 Corinthians 13 for that duty.
Evangelism and church planting took off globally when Pentecostals began to follow that pattern early in the last century. More has been accomplished toward fulfilling the Great Commission by tongue-speaking charismatics in the last 100 years than has been accomplished by the cessationist church for the entirety of its 17 centuries of history. Honestly, this is the definition of a no-brainer.
We need to be baptized in the Holy Spirit with the evidence of speaking in tongues. If someone hasn't received it... yet, he or she should not be treated badly or ostracized, but should merely be encouraged to continue waiting in faith. The only division this experience needs to cause within the family of God occurs when someone tries to prevent folk from speaking in tongues. That is clear disobedience to the Word and is awful, but trying to force someone to do so who doesn't... yet might be just as bad.
