I have to say that in my entire FH2 career, I have never heard anyone use voip. This could be due to some problem on my part that makes me deaf, or I'm not in the right squads. It all looks chaotic because you were on the only consistently populated server - i.e. everyone from the teamplayers down to the vBF2 lone wolves is on that one server. After a while though, you should come to recognise a few names of good players to squad up with.
Generally though, just try to stick to where your SL is, even if they are acting a bit odd. And if they go mental, you can allways try starting a voip squad like Schneider said (I'm sure some people would join it).
And on the off topic of bren carriers: have you tried rolling one over and using it as a short lived pillbox? Its fun (but hard to do right).
Yesterday evening you were in a squad with Slayer. He used VOIP, so there you go, you are VOIP virgin no more.
@Sten-bullets
Usually you can find teamplay with squads named VOIP, Teamwork or Clan names.
Stick to your SL, ask which kit is needed the most, where to spawn, etc.
You can also teamplay without being in a squad. I like the temaplay between a good spotter and an Arty man.
Or between bomber pilots and people who spot enemy tanks on the grounds.
Looking forward seeing you on the battlefields.