Listening is the most difficult skill I ever had to learn.
Listening is not ear-training.
Taking dictation is not comprehending.
Listening involves hearing the whole, not the dissected parts.
A well-crafted composition becomes part of your physical memory even as you take it in. Hearing is a physical activity, not a mental exercise. Some people combine the two effortlessly, as professional sportsmen and women analyze as they move, calculate as they throw the ball. But it is not required that you master that level of skill in order to enjoy the results of a composer's hard work.