The whole "no build step" was the most underrated factor for its success, because it was such a low-skill tool to pick up.
The tightness of that edit-test-move loop was why I used it, even if the "edit" included "sftp it to a vhost".
That bit is what made it successful & I can't think of anything I've used in the last decade which felt as easy as PHP for that particular style of self-taught programmer.