There's a difference between God inwardly sanctifying you and the Holy Spirit's guidance, and people saying God told them to do stuff.
I don't think one can sanely maintain that God "tells" them anything. The canon is closed. Special revelation has ended. God has told us that His Word, as revealed to us in Scripture, is sufficient for us. I have a problem with people claiming "God told them..." for several reasons.
It's a license to sin. A lot of times, people will in essence say that while what they're doing is wrong, God gave them a pass. He told them it's alright. For example, "Yes, I know the Bible says that fornication is wrong, but I feel like God is saying that it's ok, because we love each other."
It's obviously not, but once we allow for this type "revelation", that's what we're left with. As a result, Scripture is reduced to a big book of suggestions that are easily dismissed by the delusional prophet(ess).
When we accept that type of behavior, we also marginalize our view of Scripture as a whole. It's only part of the message which hasn't been fully conveyed. The full message remains to be completed by us, as we interpret what God "tells" us.
Moreover, how can people readily discern what God "tells" them, when, by in large, this "revelation" is based on what people feel. We know from God's word that the heart is evil, and no man may know it. How then can we trust what people "feel" in their hearts, who then interpret it to be that "God is talking to them".
Finally, how many people in the history of the universe have been able to say God spoke to them. I'm willing to wager the number is below 100. Out of the billions who have lived, I find it hard to believe God "told" them anything without a sign that they're a genuine prophet.