Do you think osu really help with your aim in games like Minecraft, CSGO and more?

It depends. If you use mouse to play, yes it does since you get a better feeling for distances with that mouse so you can flickshot easier in games. Also your reflexes improve greatly. But you have to keep in mind that theres more to getting "good" in a FPS than that, like learning to spraycontrol different weapons, knowing mapspots and so on