Like many, I have switched to zsh a few months back and have enjoyed the experience thanks to Oh-My-Zsh. I will give it a go, but I don't know if I can really appreciate the difference.
I think you will. Perhaps not so much when using oh-my-zsh but when you want to tweak your prompt I find fish's syntax far more sane.
Having played with it for the last 30 minutes or so, I think I will stick on Fish Shell. Surprised (and amazed) by how simple it was to get started and set up my traditional startup scripts. And the auto-completion is just amazing.