Well I guess the intent is the same but it looks a lot more like Vundle (or Bundler). You just have to define the package name in a textfile (like with Bundler) instead of managing git submodules or downloading plugins another way into their own folder.
Antigen can pull plugins (or modules as prezto calls them) from prezto too. This is a recently added feature which might break occasionally. I personally don't use the prezto loading features in Antigen.
I started using antigen for my dotfiles (https://github.com/js-coder/dotfiles) a while ago, and it's really awesome. However it does make sourcing `~/.zshrc` pretty slow.
I've seen antigen before, thing is, zsh plugins, especially useful ones, are few and far between.
I have ~30 plugins installed with Vundle, and regularly add and play with new ones.
For zsh I have exactly two (syntax highlighting and one I'm forgetting at the moment) and I can't remember the last time I saw another that looked useful.
The big difference as I see it is that the primary hassle with plugins in Vim, the fact that plugins normally all get dropped into a single directory and mixed around in such a way that they are nearly impossible to remove, doesn't really exist for zsh. You just source files wherever you happen to put them.
The features Vundle has that surpass Pathogen are also the features that I don't really consider that valuable.