No idea about first world countries, but in Russia there are broadband ISPs who throttle or completely drop P2P traffic for various reasons. Don't know about VoIP, though - the only cases for blocking those I've read about are corporate networks with their inhumane firewalling.

I can't say throttling/blocking is completely universally bad - for example, we (I work for an ISP, too) had to drop uTP traffic when uTorrent just rolled that protocol, because due to high-PPS low-size packets it put quite a heavy strain on routers, so everyone had worsened network experience. Even though that was somehow controversial decision I still think that that blocking brought more good than evil (we didn't block classic BitTorrent protocol by any means, just uTP) so there should be some rare and sane exceptions from Net Neutrality rules, but nonetheless... the point is, that happens on broadband, too. Just less often.