Worth it in what sense?
In terms of ECs, you should do what is right for you. What is right for you, what was right for me, and what is right for someone else are three entirely different things.
You might want to read the “applying sideways” blog on the MIT admissions web site. As I understand it, it recommends that you do what is right for you, and whatever you do, do it well. This is the approach that my family has taken and it has gotten the four of us admitted to eight different very good universities (one each for a bachelor’s degree, a different one each for graduate work), and only one of them was MIT. However, the four of us did four very different sets of things to get wherever we are today.
For me personally, robotics would have been way more interesting than any of the other things that you mentioned, and would have been a good EC for what I ended up doing in university. However, just because it would be a good choice for me, does not say anything about whether it will be a good choice for you.
I would have also. It looks like good educational fun to me.