I must say, I never quite got the whole Rush comparison for this song specifically (I could agree with it but I likely wouldn't have a drawn the comparison by myself), I mean DT have a bunch of 'Rush' moments in various songs.. But just the other day, I had DT12 in the car stereo while going for a drive with a buddy of mine. He likes Dream Theater but he doesn't nearly follow them as much as myself. I guess he thought it was mix CD or something because when we hit the 3rd track (before the vocals) he turned his head and said to me "Rush?". I couldn't believe it, his comment surprised me and I just laughed. This guy doesn't listen to Rush, just heard them through me sometimes and he instantly thought the start of TLG was a Rush song...
So... Yeah, I guess it does have some kinda Rush vibe goin on there, at least with the guitaring.