There's a bunch of good uses for them (but none that outweigh the privacy problems). For example when you look at someone you met before it can pop up info about them like their name, business relationship to you, topic interests you've talked about before, etc.
Shots against seasonal flu, RSV, tetanus, diphtheria, and pertussis (Tdap), pneumococcal infections, hepatitis A and B, and typhoid have all been linked to lower risks. And one of the strongest connections is from vaccination against shingles
In the Organic Maps app just tap the button with 3 lines (≡) in the lower right corner, then tap "add place". To update info on a thing that already exists just tap on that thing and then tap "edit place" at the bottom of the page.
I've been eating generous scoops of it with my finger, so i think I'm already in the deep end hah. The taste does grow on you