The reason those in the Old Testament, such as John the Baptist, did not speak in other tongues was because the Spirit had not yet been sent back as our comforter. Jesus didn't send back His own Spirit to comfort His followers until the Day of Pentecost, after-which all of those that were filled with the Holy Ghost began to speak in other tongues.
But the Spirit was still with them and in their lives.
In either this thread, or another one, it has been said that tongues is evidence that a person has received the Holy Spirit. In the OT, King Saul received the Holy Spirit and prophesied, 1 Samuel 10:10 - it doesn't say he spoke in tongues. David prayed that the Holy Spirit would not be taken from him - again, tongues not mentioned. The Lord told Ezekiel that he would put his Spirit in people, and prophesied through Joel that the Spirit would be poured out on all people, Joel 2:28-29 - fulfilled at Pentecost. Prophecy mentioned, not tongues.
Tongues is one outward sign that people have received the Spirit. There are others, and sometimes a person doesn't speak in tongues at all.
These people might have certainly had an encounter with the Spirit, but I couldn't say they were filled with It because the evidence of tongues was not there to verity the infilling.
Doesn't matter whether
you could say it or not; they were.
Jesus said that the Spirit would convict people of sin, John 16:8, testify to Jesus, John 16:14-15 and draw people to him, be with them and IN them, John 14:18-20 be their comforter, John 14:16, guide and the very reason they are born again, John 3:3. I know what Mark 16:9-20 says, but when Jesus taught the disciples about the Holy Spirit, his work and that they would receive him, he didn't once mention tongues as evidence of this.
Paul said that the Spirit assures us that we are God's children, Romans 8:16-17, and that no one can declare that Jesus is Lord unless they have the Holy Spirit, 1 Corinthians 12:3. He also speaks of the various gifts that the Spirit gives. Speaking in tongues is one of those, but not the only one or even the most important.
I could be enabled to speak in tongues tomorrow, or even today. If that happened, it would be good, but would not make me any the more acceptable to God, or show that I was filled with the Spirit for the very first time.
I have no doubt that some on here would think so, however, and may even start to treat me differently. But it's how God sees me that's important, and he knows that he has filled me with his Spirit. I know it too.
By the way, the Spirit is HIM, not IT.