Yep, the main riff and verses are 13/4 (6/4 + 7/4 is probably the easiest way to count it) in B, then it moves up a half step to C in the bass and kicks into straight 4/4 at the same time ("I could show you, I could show you"). This adds tension, which is somewhat resolved as they drop back to B, still in straight 4/4, and with different chords ("It's driving me mad..."). Then it throw in bars of 3/4 ("I... I...") two and three times. But it all flows past you with a straight beat and steady meter, so only music geek like me realize (or care) what's going on. Also, it's two long verses and a single chorus, which is kinda weird, too.
This is one of my favorite Genesis songs. It's like how Rush manages to score radio hits with pop songs that are accessible enough to get radio play, but really are prog if you dig into them.