I have add visitors who contacted me because they couldn't do search for a keyword. When you start adding more content or writing more blog posts, a search feature is absolutely needed; else your visitors will leave because they couldn't find the right information.
CTRL+F is not a valid option as it'll only look for text on the current page (doesn't search in older blog posts or in the details of the blog posts).
Hope this feature can be implemented soon as my site is growing and it'll help make it more user-friendly.