I know some people who spend a long time plotting everything to the point that they just have to fill in a few words and they are done. For them, it works. It's structured, it's clean, and they can quickly write out scene upon scene and finish very quickly (in a sense). The work they do on the front half, reduces the work they do on the back half.
Then there are people like me, sometimes called "seat of your pantsers", or "pantser" for short. Now, I'm not a complete pantser as I actually do preplan a little before writing a chapter. I also have a pretty good idea of where my story is going. A true pantser just writes, and writes, and writes, and lets the plot set itself.
Either way you do it, there will always be the need for editing and revision. Nobody is perfect.
I've also decided that I'm somewhat boring with my blog so here is an obligatory random image from: http://www.fanpop.com/spots/random/images/4954525/title/fantasy-art-wallpaper. It looked cool. No other reason. :D