I've been using discord since mid 2018, and got Nitro shortly after. Loved longer messages, bigger file uploads, and HD screensharing, especially after Mixer went down (FTL streaming was the only service that let me share my gameplay to friends fast enough for them to react).
That moved to Discord Classic, I kept those things that I use daily, and its worth it to me. It took a lot of convincing to get my friends to migrate from my self hosted Mumble server to Discord for voice chat... Before Steam revamped it's friends interface, there weren't a lot of good options. What were you gonna use, Skype? Teamspeak?! Discord isn't nearly as valuable today, in 2023, but at the time it was worth it. Till it starts to come apart at the seams, not sure why to switch.