In the Forums section of the site, you can highlight text in a thread and get a Quote popup block that then allows you to easily quote in a reply. You can easily do this multiple times to cherry pick a bunch of things to include in your reply without the hassle of manually copying and pasting, as was the case in certain older versions of the forums.
This feature is an amazing QoL feature that I love. Perhaps it could be improved to include a link to where it came from, but that's a minor improvement.
However, it's not supported on any of the other parts of the site, such as blogs, tutorials, and news, so I'd like to suggest adding support to it to any page that supports comments.