@Wmx
As to the acronyms, they are quite popular in most online games, I think, not exclusively LoL or WoW. It is possible that players who prefer 'retro' MMOs -- such as LotRO or DDO -- use relatively less acronyms, than those who play more 'mainst…
@Wmx I think people tend to use various means of voice communication these days, particularly when they do something that could be challenging in terms of gameplay mechanics: e.g. raiding, group organised PvP and so forth.