Quick Thankgiving Prep

I'm in charge of mashed potatoes this year for Thanksgiving. In the past, I've peel 10-pound sacks of potatoes. This year, I'm trying this trick:

I read somewhere that you should score the potato skins, but I'm not sure if that's necessary.

This trick to quickly peel hard-boiled eggs blew my mind:

Have you tried any of these tricks? Did they work for you?