jQuery in a CMS

I have used jQuery twice in the past month to get some custom behavior from a CMS. In the first instance I used it to re-URL a site for Xavier, and in the second instance I used it for some custom menu options that weren’t available in WordPress. I like the results it produces, but I always worry a little bit about JavaScript as a solution. I would much rather keep things server-side, but sometimes client-side is just easier (and almost as reliable).