The effect is dramatically different for different people. I have something around 30-60% more endurance with creatine which is insane. From what little I understand it helps move fluids though muscles. I can't imagine muscle growth doesn't benefit from that specially in seemingly poorly hydrated dry muscles like mine.
For myself, after switching to vegan food, taking a creatine supplement had very noticeably improved the endurance for things like weight lifting or short sprints at maximum speed.
However, that has just restored the level of performance from when eating non-vegan food.
The effects of creatine should vary both between humans, because they may have different capacities for internal creatine synthesis, and depending on the kind of food that they eat, i.e. whether it is naturally rich in creatine, or not.
