How long
I've been using Linux for over 20 years now, full-time. And I've been using it as a daily (work) driver for pretty much over 12 years.
Which distros?
I stick to Debian-derived. For servers I try to use Debian, but sometimes switch to Ubuntu if I need some more bleeding-edge software.
Desktop I run the latest Ubuntu LTS, and only upgrade to a new LTS.
For what?
I have a couple of VPSes that run various websites and selfhosted tools (like gitlab, bitwarden), on Debian/Ubuntu.
I run Ubuntu on my XPS15 as a development powerhouse, so that's Chrome/IntelliJ/Docker and a various host of other tooling that relates to my work.
Also I fiddle around with my Synology NAS (which runs a Linux variant) a lot, and still have a Pi with Raspbian running in the house.
You try gaming on it lately?
Actually, yes. Steam + Proton is AWESOME. I agree with @webhead that this is a major leap in consumer gaming for the platform, although purist will say "ye but its wine". As a consumer idgaf, and I'm glad I can finally play (most of) the games I want without any hassle.
Verdict
People around me use Windows, a lot use Mac, but they are all idiots. Linux is win.