I generally have a worktree to develop in, and one for code reviews. So I can leave some indexed and some uncommitted changes in the first one, open a second IDE against the second one and use "find usages", "go to implementation" and other code navigation features missing from GitHub.
You can also create a worktree for a quick experiment (eg how many conflicts when I merge X and Y) and just rm it when you're done.
Sure, all these things can be achieved with git stash and git reset... but they are both difficult to keep track of and will cause your IDE to run its expensive reindexing.
It's kind of like how you could use pushd/popd and open subshells to work in one shell, but people prefer to just open another terminal window.
You can also create a worktree for a quick experiment (eg how many conflicts when I merge X and Y) and just rm it when you're done.
Sure, all these things can be achieved with git stash and git reset... but they are both difficult to keep track of and will cause your IDE to run its expensive reindexing.
It's kind of like how you could use pushd/popd and open subshells to work in one shell, but people prefer to just open another terminal window.