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Discord UI rule
(lemmy.world)
Be sure to follow the rule before you head out.
Rule: You must post before you leave.
According to data dating June de 2022. Matrix had at least 64 Millon users.
That is not a small number. So yeah, people do use it. While it is significantly low compared to Discord. Keep in mind that Discord has had much more advertisement done for it than Matrix did.
Counterpoint: My friends don't use them (and won't switch)
Matrix allows bridging chats so you can set up a bot in your / your friends server(s) and it'll forward their messages to Matrix and yours back to Discord. As for DMs you need to set up channels for that afaik (Future me: It seems that some bots support it). The big drawback is that you need to disable Matrix' E2E-Encryption in the rooms you want to bridge your chats to.
Here's a link to the Discord bridge if you are interested. It's not that hard to set up imo.
As for voice chat, you can use Jitsi (works like zoom but without the need of an account) as long as your friends aren't too lazy to open a link in their browser to chat with you.
As for Matrix clients there's Element, FluffyChat, Cinny & others. Element & Cinny are closer to Discord's UI whilst FluffyChat feels more like WhatsApp Web or Telegram Web. Element has cool features like web widgets you can pin to rooms whilst Cinny & FluffyChat are simple (and have MUCH better custom emoji / sticker management)
Matrix Clients like Element, Schildichat & Fluffychat have Jitsi integrated into them for Room VOIP so making a separate account for a Jitsi instance is not necessary.