I got an M.A in Creative Writing and I also did a year-long module in it for my B.A. It was the first course that spurred me to attempt the M.A.
Getting the professional help and guidance enables you to hone your 'craft' and you are able to see your work with what's called a 'fresh eye'. Going on a course will teach you the best way to present your work and ideas. It will teach you about different structures, word-formations, tone, colour, mood, texture, humour, mixing senses. Also, where the power and the flow is improved and how.
On the first course, I found that the tutor knew how to generate the ideas in me, when I thought I was dry ; for example, pick a colour and give it a human voice in a text or poem, make it come alive. Does it like being pink or blue, if not, why not ? If it does, what does it like about our world................what does the world think of it...........etc. You will learn a lot about different voices in your work and perspective, just like in art.
Go for it ! You won't regret it. One day you'll be able to help someone else with the technical knowledge of it.
But just remember, it's subjective, learn to take the criticism because not everyone reads your work in the same way as you do.