Contrary to popular belief, I do not have the entire codex and support forum contents in my head. There are a couple of tools that make searching for WordPress specific information a whole lot faster, and my job as tech support a whole lot easier.
Even if you’re not looking up plugins and codex references for clients, customers or users, if you’re a dev these may make your job (or hobby) just a little bit faster & easier.
WP Codex searches the codex. One less click. 😉
Both of those are a *lot* faster than simply bookmarking the search page.