The time it is really beneficial is during strength training. Our bodies utilize creatine during anaerobic activities which is about the first 20-25 seconds for people. It will help you during these activities.
Your hips are huge for controlling your knees. Strengthening the gluteus medius and Maximus and making sure you perform single leg activities so you are not compensating with one leg will be huge.
Not saying it does not help some people but the overall research on it is poor. If you look at large studies there is no more improvement with it than with a placebo.