Why anal retentive is VERY BAD

I am now going to bed, just 90 minutes after I had expected to. Earlier this week I downloaded an update for iTunes and it reset my preferences to scan for my library on my HD instead of my external HD (where I keep everything). Somehow this fucked things up and I've spent the last two hours restoring it, ironically from songs that are already on the external in my iTunes library folder. I wish I could have let this go. I am letting go about 20 songs that are just gone and need to be re-imported from the CDs.