That water that comes out with people can be minimized. Certain types of suits hold less water than others, human skin being the best - and if you can just get up and stand still for a moment or two and allow the water to run back into the spa before you step out it will make a noticeable difference.
In cold climates, this may not be possible, but here in paradise we learn this trick early on.
Also, opening the lid slowly to allow the water on the underside to run off into the tub helps. I keep saying I'm going to get a squeegee for my bottom....
Not that it's a big deal to add water now and then, but these are tricks we do to keep from dragging more water out of the tub every time somebody gets out.
During a wet test in the showroom, it becomes very obvious: some folks who have never owned a spa will simply stand up and get out. If I'm not right there to stop them, it makes an amazing puddle on the floor. If I can ask them to get out more slowly very little water will hit the carpet.