I only got on VCs to hang out with the lads in CMB server (which is fine). Hell, a few good lads I know are known to me due to discussing things in VC especially when I was just writing up the poems for my cop.
Big but! I made the rules clear on myself to not use it in the middle of RP. When I got on the server, I would just not speak or instead get off the VC (except a few times which was le VC for raids and shit, which to this day is a chaos for me to understand what's happening unless you are actually paying attention).
I see the cool stuff, but that was because I actually used it as any regular VC on discord. People will for any reason use outside of the standards I set for myself, and they will not output the best quality of a character. At times it was for metagaming (but for nonconsequential stuff), but I see the dangers, indeed.
In conclussion, I would advocate it for when basically not being on server, but I certainly can't say the same for actual in game stuff.