This means to say that basically, people are too afraid and complacent to step out of the routines that they have been taught, as if they were dancers. Knowing this, other lines like, “I get nervous when I see an open door,” also make a little more sense.

The dropped “s” is something that Flowers has done a lot in songs like the hit “Mr. Brightside”, in which he often sings, “Open up my eager eye” instead of “eyes.” It’s just easier for a singer to be clearer when words don’t end in “s”, which would create a bit of a hissing noise.