Definitely agree! I switched to Spacemacs about 1.5 years ago and the increase in productivity was amazing.
If you work with Git a lot, it's worth looking at for Magit alone. The way you are able to perform complex tasks with a few keystrokes is a huge timesaver for me.
- Magit, to quickly organize hunks into commits and do general git things
- Org mode, to organize TODOs, thoughts and even draft code snippets and designs
- Language-specific layers with great features (usually REPLs, support for refactoring, autocomplete — stuff you expect from any other IDE).