I was watching some top 10 drummers list on YT (maybe like 6 years ago), I saw Portnoy playing that solo in ytse jam, and that's the first time I ever listened to something by DT. The drummer of my band became a fan in the future, and he kept convincing me to check DT out (but I was too lazy lol)
But I checked out Panic Attack, and it was an ok song to me (but not good enough for me to start exploring the band, I also hated those James' vocals)
So, 2013 came by, self-titled just came out, and my friend was like "omg you have to check this song Illumination Theory", and I was like "ok, ffs, I will check it out", annoyed by his insisting, so I decided to give the band another shot.
Got home, lied down, started the song on YT, and 20 minutes later, I concluded that was the best metal song I ever heard (note that I was a metal fan for 5 years then, and that it was my FIRST listening to that song)
And the rest is history, in like a month, they became my favourite band
So, I'm not a long-time fan (not even for three years), but since I became a fan, there was hardly a day to pass for me without listening to any DT song