I used fish for a while, but the fact that it is a clear break from bash / sh syntax for things like chaining and redirecting made my reflexes all wrong. I'd type `dothis && dothat` and fish would just say, "umm, I think you mean `dothis and dothat`", or I'd have to use a bash subshell to run some command someone else wrote with some fiddly find syntax piping to xargs. So I just switched to zsh. Less cool name, but my reflexes are once again correct.