I have the same problem. I mainly use zsh because it's not drastically different from bash but still offers some useful things that bash lacks. But, honestly, we should just bite the bullet and move on to something better. Yes, we will still need to write scripts in bash from time to time and maybe we'll need to look up a few points that we've forgotten but we won't forget the fundamentals and that's all you really need. Well, that and a web search.