Scifience - congrats on your purchase, and welcome to the ranks of hybrid owners!
I can't see from your profile where you're located. Because that's what I'd base my advice on - Do you live in a heavy snow belt state ? Somewhere with lots of salt air ? I might think about it, then. In sunny AZ ? Don't bother.
Honda had some legendary problems with rust until the early nineties (I had an '86 Accord hatch that succumbed to rust moreso than mechanical failure, back in '93-'95 timeframe). These days, pretty much all manufacturers use galvanized steel, and give their cars sizeable corrosion warranties (Honda's current warranty is 5yrs, unlimited mileage, per their warranty booklet (pp32)).
I live in N. IL, and we get a decent amount of snow, and even more road salt.
That being said, I didn't rustproof my '97 GrandPrix, or my '01 Accord. And save for a tiny spot on the roof (!) of the Accord where it incurred stone damage (long story), I had no real problems with corrosion. With that in mind, I have not rustproofed my new HAH, and doubt that I will.
One thing I *did* do was have the 3M paint protection film ('clear bra') installed. Honda's paint these days chips off rather easily; there were so many nicks & cuts on the front end of my '01 Accord, that I resolved to avoid having that happen to my next car.