That little editor in my head wanted to pop out while I was writing and "improve" upon my creations. And I let it, thinking that was the way. In the beginning it was as though I was drawing each word to perfection before proceeding. Then I developed a list of mistakes I tended to make the most often (such as unnecessary words and phrases or too many adjectives, etc.) and waited until the first draft was done to apply the self-editing process. That not only allowed my creative side to run unhampered, but created a hidden benefit. Creating that list made me so aware of these error tendencies, that they became ingrained and I automatically avoided them. I can let my "right brain" run free and my "left brain" just waits and gives a quick run-through. That approach, plus the computer, makes writing a much quicker process and more satisfying. 

There is another approach, one I consider a responsibility. Every piece of fiction or nonfiction must be done well and communicate something of value.  It may be a point of view or a theme or a depiction of something we need to change in our society. Writers have power of a lasting sort. It should be used wisely and well.