Yeah, after installing it earlier today and using it for the first time plenv makes sense to me because I'm also using shims over in pyenv- and rbenv-land, so I set it up like this:

  $ echo 'eval "$(plenv init - zsh)"' >> ~/.zshrc

There's a consistency to them all doing essentially the same thing on my rig (i.e. instead of exporting shell functions to switch PATH).