It's cute enough, but one water ride per park is enough.
Maybe I am oversimplifying things here, but...
A ride requires a moving vehicle, right. Well, that vehicle can run on only a few things - Free moving wheels - needs a driver so ixnay on that; Wheels on track - either a rollercoaster, rail ride (most dark rides) or a suspended system; on water (a water ride); or by air - and I don't think anyone has come up with a decent aerodynamic ride system yet. We all ready have a ton of track based rides, so why not use water.
Just becasue it is a water ride there are still many ways you can have it. You can have a heavy rapids like Kali, or a calm flume like It's a Small World. the boats can be linear or they can turn all around. All boat rides are NOT alike!