I played national level sports in high school and had a D1 opportunity in one of the big 3. Didn't list that. Eagle Scout is an honor that follows you for life, and like
@Neopolymath said is often used as something that is viewed as representing character and leadership. And no, it isn't just at the good old boys programs either, the PD who was the most into it and literally told me it was one of the main reasons they interviewed me was the exact opposite of an old white guy.
I listed my ES because of two reasons,1. I had multiple physician mentors tell me to, and 2. my dad told me his has come up in every job interview he's ever had. It's definitely something that can be a talking point, and more than a few people in positions that matter obviously take it as an important accomplishment. After what happened this application cycle and seeing how much it came up I will list it on my CV until I die.
I think people forget residency is a job application, and there is more to life than just excellent academics. On similar train of thought since it came up a bit ago in the thread, I have no idea why anyone would not list work experiences that didn't occur in medical school or weren't healthcare related. Work experience is significant to employers, even if it is just being a part-time McDonald's employee in college. No you can't overcome crappy academics with tons of ECs, work, and life experience, but if you only have academics you're going to struggle pretty bad as well and then post on Reddit complaining how you didn't get the residency you wanted even though you did "everything right." I've seen that story play out far too many times for it to be a coincidence.
/end soapbox