"Desired" and "Admired" are very strangle labels, it like the question(s) might have been:
Which development environments did you use regularly over the past year, and which do you want to work with over the next year? Please check all that apply.
In which case VSCodes high "desired" score just means that it was widely used?
The different worktrees share the same .git state. The article has an example where the author uses one tree for writing code and one for fuzzing it. If they used multiple clones they'd have to push from the writing directory and pull from the fuzzing directory to get new commits to fuzz but with worktrees this state synchronization between different git directories happens automatically.