I'm an incredible ride chicken. I get nervous before PotC every single time, because of the drop. I normally love the circle raft rides at amusement parks, and when we visited WDW during warm weather for once (our usual trips are in Nov & Jan), I said I wanted to do Kali. My DH, who knows how much of a fraidy cat I am, went with me.
Now...everyone who is saying it isn't that bad of a drop...for me, it was HUGE. I don't normally do anything like that. And get this, we're spinning as we get to it, so I'm backwards and don't even realize it's coming. I'm just thinking happy little rafty ride, wet, waterfall, yay!...and then we're waiting at a gate. I wonder why we kind of stopped, so I look behind me and I was like "OMG!" I look at my DH and start screaming at him that how dare he not tell me...and then the gate let go and down we went, SWOOSH. I hated every millisecond of it. My heart was racing so fast that I pretty much missed the rest of the ride.
Then, I got off...and nearly immediately demanded that we go again.
On the same trip, I decided I was up to trying Thunder Mountain...and I conquered that one. TM is one of my favorite rides now. The last time I went, I barely got the twitchies at all.
So, my point is, it is a drop. It is not Splash Mountain or anything like that, though. It is still far more of a drop than that type of ride normally has. In addition, that's about the only excitement on the whole ride. Whereas I will happily go on Thunder Mountain again, I'm hesitant to do Kali, just because the drop is pretty much all there is, and that's not what I enjoy about that type of ride.
Not to betray my WDW love, but if you happen to be going to Universal IoA on the same trip, the Popeye's Bilge Rats Barges is the BEST of that kind of ride (circle rafts) that I've ever been on (and, as it's one of the few ride types that I consistently ride and my DH loves going to amusement parks, I've been on lots of them), and Popeye's is also the wettest! It's a million times better than Kali, and there's no drop to it.