Maybe you don't want to use one. The nice bit about running one, however, is it doesn't get in your way if you never use it. This is what I do, and I rarely find it useful; but it won't (or shouldn't, at least) noticeably affect performance on 10 year old or newer desktop systems.
Perhaps I almost always don't need it because I do the majority of my text editing in [g]vim, which already has a similar feature through registers (:help registers if you're curious). Registers provide vim with a built-in clipboard manager, which works only inside vim; so if you want the same ease within another text editor (though I doubt it would be quite as easy), you could find one useful. Between vim and other programs, I just use the primary selection and regular clipboard, and that's been plenty.
Remember that you already have two "clipboards" on *nix systems: the primary selection plus the clipboard (there's actually more, but they're very rarely used). This is a feature of the X Window System. Whenever you select something (i.e. highlight), you can enter it in another program with a middle-click. Wikipedia's article isn't kidding that you'll predominately use the primary selection once you get used to it.
However, programs usually limit use of the primary selection to text. For example, open both nautilus and a text editor. Select a few files, then try to middle-click in the text editor: it won't work. (Nautilus doesn't acquire the primary selection so you'll get whatever was previously there, if anything. It could have been designed to do this differently, but it wasn't—I don't know if this was deliberate or not.) Copy those files to the clipboard (ctrl+c or edit > copy), then paste in your text editor to get the filenames.