Thanks, @turingtest2, for being reasonable and for taking time to understand my pont of view.
I don't use iTunes as a music library. I use it as a music player and music transfer application to my iDevices. And that's fine by me.
With automatic sync, you're only "allowed" to sync your iPod in ONE SINGLE COMPUTER (or library, whatever...). For me, that's more traumatic than making a regular backup of the iPod from time to time (using SharePod, keeping songs in a separate folder, exporting playlists, etc).
Since we've had more than one computer at home - with one booting always a lot faster than the other, for me, manual sync is the logical and least traumatic way to go.
If my desktop was booting slowly (I live in Brazil, everything here is expensive, I can't just walk into a store and buy a brand new computer if mine isn't fast enough ...), I used my mom's laptop. Then I got my own laptop, and it was as fast as the wind for a while. Then it's not so fast anymore, but I got a new desktop that boots fast. And my mom got a brand new laptop, even faster than my new desktop. And they all have iTunes.
I like to listen to a lot of different songs, and I use my iPods (I have a 8 gb 2G and a 16 Gb 5G) primarally while driving or running.
Since I'm always late, when it comes to my mind to listen to a certain kind of song, I can't be bound to a single computer.
I've researched automatic sync since this "discussion" started - never had the patience to do it - and undestood how to do it properly, how it worked (https://www.youtube.com/watch?v=XrqAuxR3xUg), but this "bound to one computer" thing is a dealbreaker for me.