At the risk of sounding like some kind of stick in the mud here, I might respectfully disagree with the Nice Bright Colors<tm> thing.
Contrary to the lyrics of the song, Kodachrome doesn't show you what's not there. Kodachrome doesn't sucker-punch you with hues reminiscent of an explosion in a paint factory! Kodachrome shows you the way it is, not the way some might wish it to be.
Compared to today's films such as Velvia or even Reala, Kodachrome is more muted and less saturated.
And ... at the risk of sounding like the biggest stick in the mud there is ...
Even though I love Kodachrome and have since I was in my teens, I never really cared for the Paul Simon tune. Sorry. I always considered it to be yet another commercial-pop tune that was overplayed on AM stations, and one of S&G's (individual or together) weaker numbers. Hey, if you like it, all the better. If we all liked the same things, this world would be a very boring place! 🙂
(Yeah, I took some of this from a recent blog entry I did.) 🙂