By using the comment headers shown in the first GIF, you can create an arbitrary hierarchy of sections throughout your code. The navigation features allow you to zoom in on specific sections (by folding any surrounding code), search sections by the titles used in the comment headers, & also collapse/expand sections by the indentation level of comment headers.
I created the plugin to extend Sublime Text's native code folding & go-to functionalities:
@ ST's folding : code can only be folded by indentation
@ Parkour's folding : code can be folded by user-defined sections, each with an indentation hierarchy of their own
@ ST's go-to (for python, at least) : only classes & defs are listed
@ Parkour's go-to : all user defined sections are listed
Thanks for the input! I'll try to make my next examples a bit more informative.