If you liked the sound of the vocal, here is how I did it. I believe this is also the reason certain people also commented on how the vocal doesn't have quite enough focus. I went back and forth on that myself for quite a while finally deciding that I liked the spaciousness of that wide vocal sound on this particular track.
I cloned the main vocal track and then, using the slide control, I slid the copied clip 30 ticks forward, and then messed with the panning of both tracks to create a stereo spread. You hear the main vocal come in on the left, and 30 ms later, you hear it come out just a bit louder in the right speaker. The panning is something like 10 o'clock for the left side, and then about 3 o'clock on the right. Then the whole thing gets run to a bus which is processed with delay.
I was worried that when somebody listened on mono, the voice would become very indistinct. But when I tested it in mono, it seemed fine. Always wondered how a mix like that would collapse down to mono since the voice is not directly in the middle. But you hear it done that way often ... the new Mumford & Sons song "Believe" comes to mind ... at some point you can hear the vocals get the wide stereo treatment and it really adds a fullness to the song.