Many people said that submitting image or video sitemap to Google was very helpful for ranking purpose. On the other hand, also many people differ this opinion. They believed that if we submitted the site map to Google, then it would get more information about the site and if the sites doing any wrong thing or if google finds any error on the website, then it would be punished quickly compared to who did not submit their sitemap. So, now I would like to know your opinion about Google Webmaster Tool. Should I use it or not? Please share your thoughts. Thanks to all.