I had a good laugh at that. 😆
SWToR was released before CoH was closed down.
WoW came out the same year CoH did.
Regarding your question, none of us can talk for the COH community only our own personal pixels of it. I use Discord to talk to the friends I play CoH and other MMO's with, I don't join and chat in PuG servers for trials/raids/etc. The CoH:HC Discord channel has chat channels should people feel the need to use them for coordination, but I've always found that well organized trials and Mother Ship runs using basic commands in in-game chat to be effective enough.
Edit: Your first post wasn't exactly clear regarding vc. Since Discord started out as vc for MMO players especially for game that had no vc, like me I'm sure that others figured that's what you were referring to. I see messages in the CoH:HC Discord server quite often, I actually have some of the servers muted because I do not play on them. So players do use it. 🙂