Just to throw in my two cents...I'm pretty much a fan of the overhaul. As others have mentioned, the blacklight definitely puts it in the camp of more "classic" dark ride while, in my opinion, heightening the illusion of being underwater.
There's one addition that makes me scratch my head though: why did they add that random gang of fish staring at you when you first see Ariel's silhouette through the "hole" in the ceiling. Seriously, it was kind of off-putting to have those dudes creepily staring at me when I wasn't expecting it...