I've always lived and ridden on the salted roads of Michigan, and I don't have much problem with corrosion. A little bit, yes, on the cheap bits, but I've learned to live with that! Maybe for those of us who live in winter salt environments learn to overlook a little bit of the red stuff because if we didn't, we'd go crazy!

That said, it can be managed without too much futzing around. Component quality is probably a factor, favoring aluminum over steel or plated steel bits (e.g. chainrings and cogs), and replacing fasteners with stainless steel pieces. If you're a ******/shot caller, go Ti. The one area this pays dividends is in rack and fender mounts, which often get the cheapest bolts and screws. A dab of anti-seize on a replacement SS bolt and you'll be good for years.

Of course, allowing a melt-off and washing the bike helps a lot, but rust in the bolt heads and on the dropouts under the skewer contact points is pretty inevitable and hard to defeat. I'll also "+1" measures recco'd above like periodically spritzing the cluster with WD40; I don't generally need to do it, but it shouldn't hurt, I don't think. It might make the melt-off from the bike a little nastier and prone to staining, so if the bike is brought indoors or hung above anything in the garage, you may want to be mindful of that.