The best thing that my writing group do for me is to point out all the places where I have used more word than I need to. My poems always get shorter after our meetings.
This quote gets to the essence of the matter:
Taking away words lets a loud voice stick out. Does it scare you? More words will cover it up with static. It is no accident that timid people are often wordy. Saying nothing takes guts. If you want to say nothing and not be noticed, you have to be wordy.
- Peter Elbow, "Writing Without Teachers"