madari:I am SO with you on this one!! Two tracks that come to mind are "Fly like an Eagle" and "Gentleman" in BV12. They get me every time. There are moves done back to back, then next time round separated by another move etc..and unless you know exactly where you are with the music the potential for coming unstuck is huge. Even towards the end of a quarter when you can do the release in your sleep I still have to concentrate like mad in tracks like this.
Sometimes writing the chorry squences down as you practise them makes the pattern emerge. I remember one track in BV11 (can't recall at present) looked like mud until I wrote it all down and saw the (albeit rather complicated) pattern. I think the thing with Vive is just to do it over and over until the music is your cue rather than relying on even patterns.
Having said that, it does get MUCH easier over time. I can now learn the chorry in about half the time I could when starting out (on release 3) Those early days were a CHALLENGE!!. Helps to have the DVD on my I-pod too.
Hang in there-it's only your second release and I'm hearing through the grapevine that the chorry is getting simpler in the next few releases. (Probably due to feedback like yours!)
Keep Viving! We need more instructors to uphold this brilliant program...
BV11 was relatively easy to learn, except for that bloody Connect'n'Go track! That's a challenge to coach even for the most experienced instructor! But that whole release was also quite sentimental, as it was my training release 
Having said that though, I'm learning BV10 at the moment, and it is a piece of cake compared to 11 and 12. At least it will give me something a bit different to teach my class (they must be getting sick of me repeating 11 and 12 by now... LOL).
And I agree, it gets much easier as you get more experienced with Vive and the way things are done. And because a lot of the same basic moves carry over from release to release (squats, knee repeaters, etc.), you don't particularly need to spend too much time on technique, so it gives you a lot more time to focus on learning chorey and coaching and connecting with your class.
Having done BV13 in Auckland, I can tell you right now that it comes across as much simpler than BV12, so it'd be even better for you! Let us know how you go, as we are more than happy to help you out here
There is no such thing as 'normal' in this world!
Certified
BodyJam instructor since 15/4/2009.
Trainee
BodyVive instructor (awaiting certification outcome).