I've had a macbook for 2 years and I've never used spotlight beyond the initial "what does this do?" moment. Besides, you can't really do search without knowing what is searched for and from where it is being searched.
Alfred can be setup to index folders, contents of text files, pictures, etc. and harder things like System Prefs screens too.
I myself keep Spotlight on Command Shift Space for the rare occasions when I want to take advantage of the Internet connected stuff, but keep using Alfred for everything else (less to do with privacy, more because Alfred is just quicker.)