Give the recoll package (and Unity scope) a try and your opinion might change. I use this all the time and it's pretty amazing to just type a string of text into the dash and see whichever document contains that text string appear in my search results. If I already have a terminal window open I'll do grep -R "text-string" /dir/ or if not I hit the super key and type the text string for recoll, both are equally fast.