no i have done a side by side test with two blackberry storms... put them both in a glass of water for 15 seconds then let one sit on the counter for 3 days and the other in rice for 3 days... both worked fine after the three days. So a phone sitting on the counter for a few days will give the same effect as putting it in rice.
Like I said, to each their own. It worked for me, doesn't mean it will work for you. Just because you do something different does not mean what you do will work for everyone either.