We tend to think of the creation as the seven days discussed in Genesis. I believe that God dealt with man in the ages leading up to Christ's ministry differently than after because he was still in the active phase of the creation. We known from the flood that he decided the work needed a complete "reset" at least once (perhaps in part because of the nephilim, there was a danger that a fair number of people walking the earth wouldn't even be human). In any event the OT describes those ages when God was very active in shaping, controlling and managing his creation in a very direct way through prophets, miracles and the rare direct intervention (sodom, moses etc).
With the earthly ministry of Christ the creation phase ended, and this world became truly ours, to fully exercise both the agency and dominion of man.
I don't believe that God was different in the OT days, I believe that his work was different and his purpose was directed to making an ordered world, rather than in these latter days when he moves to restore the gospel to mankind. Thus the OT is important to us as a record of how god shaped us to be righteous, while the Book of Mormon and the NT express and shape our present relationship with the Father, Son and Holy Spirit.
When our children are infants we manage their world to keep them safe and discipline is based on "because I said so". When our children our older we teach by example and discourse.