Some people abuse the phrase, but the Spirit does 'reveal' truth to us, in both the Scriptures and in the natural world.
I am rather conservative, but there have certainly been many times when I knew that God had been telling me something:
either a warning, rebuke, encouragement, or just giving a new perspective on a situation or passage of Scripture.
Just to add to that, there have been VERY FEW God has actually talked to, verbally communicated with...
Gen 17:1 And when Abram was ninety years old and nine, the LORD appeared to Abram, and said unto him, I am the Almighty God; walk before me, and be thou perfect.
Gen 17:2 And I will make my covenant between me and thee, and will multiply thee exceedingly.
Gen 17:3 And Abram fell on his face: and God talked with him, saying,
Gen 17:4 As for me, behold, my covenant is with thee, and thou shalt be a father of many nations.
Num 12:4 And the LORD spake suddenly unto Moses, and unto Aaron, and unto Miriam, Come out ye three unto the tabernacle of the congregation. And they three came out.
Num 12:5 And the LORD came down in the pillar of the cloud, and stood in the door of the tabernacle, and called Aaron and Miriam: and they both came forth.
Num 12:6 And he said, Hear now my words: If there be a prophet among you, I the LORD will make myself known unto him in a vision, and will speak unto him in a dream.
Num 12:7 My servant Moses is not so, who is faithful in all mine house.
Num 12:8 With him will I speak mouth to mouth, even apparently, and not in dark speeches; and the similitude of the LORD shall he behold: wherefore then were ye not afraid to speak against my servant Moses?
Adam and Eve, Abraham, Moses and a few other very select people throughout history. Today, God reveals Himself to us by His written word and the leading of the Holy Spirit...
Joh 16:13 Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.