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Emacs has a standard shortcut for moving around in terms of paragraphs, so you don't need to customize anything. It's these semantic(ish) movement commands that really let keyboard navigation shine—moving around in terms of paragraphs, code blocks, matching delimiters is not only productive but also combines well with other commands and keyboard macros, which makes a lot of repetitive things easy to automate in Emacs but difficult anywhere else.

I have no problem going keyboard to mouse, but mostly because I use a macbook with touchpad exclusively. Reaching my thumb down right below the space bar to use the mouse is really not a big deal.

+ and basically I would generalize this across to all the common actions people typically use that are often easier with a mouse. And can even be faster, even with the extra hand travel to the mouse.