According to posts at Photoshope Elements Users, it is worth the $12. I have not seen any negative reviews about it. Some of its features seem worth investigating.
Yes, I have heard of Elements+ ...never bought it though. If I remember, I wondered if it was necessary or just marketing ...anything that says "unlock hidden powers" makes me wary ...so I never looked at it again. That was years ago though.
On the blue bar at the top of the page is a "video help" page -- look up your browser type to see if there is a suggestion of something to install to see the videos. Let me know if you need more help.