I did one many years ago, don't remember exactly which tour but it was back in the Portnoy days.
To be honest it was shorter than I expected. I guess they had a packed schedule and lots of fans to meet. But even in that short time, I had a blast! The band members were down-to-earth and cool, just like I had hoped. I managed to exchange a few words with each of them, and they even signed my old Dream Theater poster (SFAM).
I told them how their music had inspired me through thick and thin. They seemed genuinely touched and Mike thanked me for being a dedicated fan all these years. Their appreciation meant the world to me.
The quick photo was a bit rushed, but I don't care - having a snapshot with Dream Theater is something I'll cherish forever!
So, even though it was a brief encounter (and not cheap LOL), I'm very grateful I got to to meet my idols at least once.