I'm not sure I'd want to get Florida wet on a typical UK day
The rapids we have in the UK are from a much older generation of rides and have also been designed with the UK's climate in mind, so they'll be less splashy than the US ones designed for hot climates. It also doesn't help that they lowered the back rest and removed the central handrail (from Thorpe's), which given the current focus on increasing the rapids safety seems like an odd decision to have made.
They certainly can have an ability to control the level of soaking. I've ridden Grizzly River Run at Disney's California Adventure in December (23c) and September (32c) and the difference was huge, with about a UK rapids amount of wetness in December and absolutely everything beyond soaked in September.