Lol... Vox Populi isn't a single mod, and I can't really understand how something that basically changes everything in the game can be considered an expansion pack. But other people's opinions really aren't my business, so...
Anyway, if you're bored with the game, TC mods like Anno domini (and, as Enginseer mentioned, the CBO) would probably help you. I'd also suggest you use JFD's Cities in Development and Rise to Power, which add many new aspects to the game. Events and decisions would also make the game more interesting, I assure you.