Handbrake mostly and a few other video and audio editing tools.
What used to take many hours and rendered my PC incapable of gaming for the duration now takes way less time and allows me to game while it's going.
Having 2x the cores/threads I had before is like having a second monitor. Yeah, sure, I could probably do everything I do now on one monitor, but who wants to alt-tab all the time?
Like the guy on the TechDeals channel (great channel to send new computer geeks to) said, he now uses his Ryzen for everything, even gaming. It's slower than a 7700K, but the ability to do other stuff is just so much more appealing.