I love iTunes.
What it does is let you have complete control over the organization and even "sound" of your music.
As someone who used to carry around a dozen different CDs for a dozen different types of gigs, (Top40, Country, RnR, Easy Listening, etc etc etc) now I organize all my music into Genres, or use Playlists (either on the fly or pre-done on the computer - easy) and control it all from my remote control (music volume Up/Down skip track FF RW) - this is for break music at gigs btw.
Very often I have some older recordings (as MP3s) - I'm talking 20's 30's 40's, that are often "Tinny" or muffled or certainly not sitting comfortably with more modern music "sound-wise". I can go into iTunes and EQ each song individually (with pretty decent EQ presets) and boost or lower volumes of individual songs as needed, and the iPod remembers these settings for each and every song - there's more to iTunes as well, but you see what I'm saying.
You get as much out of iTunes as you put into it - I promise.