We are at Disney World right now and experienced the new Haunted Mansion additions over the last few days. We were actually in the first group of people to see the new hitchhiking ghosts earlier this week.
My thoughts:
The new effects with the hitchhiking ghosts are amazing! We were totally caught off guard with this effect and were totally surprised, which made it even better. The effect we saw was the switching of our heads. My wife and I looked at each other afterward and said "HOW DID THEY DO THAT?!" Being a huge Disney fan and enjoying seeing others enjoy what we love, it was great to hear so many people react to the new technology - it is a really impressive finale for the classic ride. WTG Disney!
The new "fun queue" was unfortunately a huge letdown. First, they have a CM standing where the queue splits REPEATEDLY having to tell people "Take the fun route... or the much quicker route." I grew SO tired of seeing people go one way... then quickly change their mind and walk back through the queue to the "quick" route. Giving guests a choice and forcing a decision based on little knowledge of the "routes" is a fail by Disney. Also, having a CM to stand there and explain the two queues seems extremely inefficient.
Now, addressing the new effects/games in the interactive queue: Huge MEH. I was unimpressed with the new games and saw a lot of people confused thinking the queue was the actual ride, saying things like "This is it?!", only to find out this was only the line.
In sum: Hitchiking ghosts, HUGE WIN... the interactive queue, MEH/FAIL.
Hopefully Disney puts more time into improving the actual attractions versus creating more interactive queues.