I switched back from zsh to bash, and I miss it terribly. Problem is, I need to run both virtualenv and rbenv, and they're both designed for bash, and don't work properly with my zsh for some reason.
They're designed to mess around with your shell variables and environment to virtualize an environment for ruby or python. Unfortunately, they're not totally compatible with my customized zsh setup, and I don't have the time to rebuild and test a zshrc from scratch. Launching bash with them would be moot since I'd just have to spend my time in bash anyways, then.