This is one of those things I'm constantly explaining to friends, clients, and others. It seems so trivial to me, the ctrl+f brings up the search dialog, but at least if someone doesn't know the shortcut surely they would know of the search dialog itself? I've found over the years this is definitely not the case, anything that's not blatantly obviously with buttons on the browser is never known by the majority of the people that I interact with.

In terms of this particular feature, I love CTRL+F and I use it on a daily basis.