The underlying goal, regardless of the type of visualization you are doing, is to reach a state of ease and relaxation. Focusing your attention on pleasant imagery and sensations in general and nature-based visualizations helps to take your mind off of whatever is going on in your everyday life. Visualizations for emotions, chakra visualizations, and energy work visualizations are simple tools for you to interact with your energy field and explore about your Inner World.
Visualization is also a good option for people who find it difficult to detach from their thoughts for meditation. It helps to stop your mind from wandering by giving it something to do, even if the “work” is pleasant imagery.