One trick I have picked up from other MOL users is removing the hose nozzle for a final rinse. On a well waxed vehicle I'd say a good 80-90% of the water sheets right off. It takes a little practice but I am sure that some of the more experienced folks get more water off than that.
Something I found that helps me on the sides is to actually hold the open end of the hose reasonably close to the finish at a good upward angle, say 80 degrees, let it push the water upwards. This seems to slow the water down a bit to let it sheet better. Holding the hose close to the finish also helps to avoid splashing water onto surfaces where the water has already sheeted off.
Editing here. I think I remember a thread with pics of someone demonstrating this. If someone stumbles across it, could you please post a link here? I am looking but can't find.