New feature of Google Search - Block the results from selected websites!!! How far does it help???

Google Search has come up with a new feature, "Block what you don't want!"

It comes as a feature after your first search query... Say you would want to block http://www.w3.org/ search results from the query "Owl", you will have to do a first search on OWL.. Go to each of the results, on a click back to google search home page from each result, a new feature "Block all w3.org results" appears next to cached and similar links.. On clicking "Block all w3.org results" link, the future results shall not be from "w3.org". The link appears even though the user has not signed in, but blocking requires the user to sign into the google account. Although the feature could help in blocking results which are offensive or are of low quality or pornographic stuff, it requires efforts from the user in traversing to the search result page of the site you would want to block.. Is'nt this a burden on the user? Would it not be better to have a settings feature where the user can first block/unblock domains he would not want in search results? Or on the first shot, on a search, the search results can directly have a link to block the corresponding domains from future search...

This feature being previously available as Chrome extension is now rolled out for both IE and Firefox users.. Developed by search quality engineers, "Amay Champaneria and Beverly Yang",
the new feature might add value to increased personalisation for the users with extra burden of traversing each link which the user would want to block..

Read more from Official Google Blog