The part I dislike is that since I use a Verizon-branded (but unlocked) phone on a MVNO, I don't get to opt-out.

I don't use data hardly ever and try to disable usage tracks and stats-gathering as much as possible, but in reality it just isn't 100%. Sure, I could root the phone and go wild tossing out all the misc. trash, but it's not worth it as much as I use the thing.