I love the weekly iteration videos, the quality is amazing and I learn a lot.
There should probably be a category “The Weekly Iteration”
A much more powerful tool than cdpath is fasd. There is a oh-my-zsh plugin for it ohmyzsh/fasd.plugin.zsh at master · ohmyzsh/ohmyzsh · GitHub and prezto also has one. Lets say I have a directory. /code/android/android-studio/sdk/platform-tools
I can type j pla which will cd me into that directory.
It also works for files, for example I have a file /code/ruby/pickaxe/stock_stats/book_in_stock.rb
Type v boo and it will open it up in vim.
Concerning the vim part of the video, I would love if you used a tool that shows which keys are being pressed.
For documentation there is a great vim plugin GitHub - keith/investigate.vim: A Vim plugin for looking up documentation that opens up documentation in dash or in browser.
If you are on Linux there is a less sexy version of dash http://zealdocs.org/ and instead of alfred you can use Synapse.
Fish shell is amazing, but it will still be some time before the community embraces it and tools like rbenv/chruby come with support for it out of the box.