That "git add -p" works from the command line is cool, but this is the one git task that I feel is significantly easier using a GUI tool (I use one specifically for this (and viewing diffs) while otherwise mostly using the command line).

I used to feel the same, and I still use a TUI tool, but after working with people who always used the CLI for this (who oddly otherwise were big into IDEs) it's actually an oddly really nice experience and not really any faster or slower. In fact, seeing a hunk at a time has this "focusing" affect on thinking about each change.

Again, though, I still use a visual tool.