The main feature I've been wanting forever is tagging. Why is tagging present in iPhoto, but not in iTunes? I'm not really into suggestions of adding tags to some ID3 tag. It's this managing of very large libraries of music that needs addressing, and allowing users to apply their own tags would go a long way to solve this.
Because, actually, you don't need any further tagging. I just wonder, what tags you'd like to apply to a song further than those present. But nevertheless you could just use the 'comments' field in your info box. And you could always use your smart playlist with comments to get categorized.
Well... there's nothing wrong with the UI as such, I like how it looks and how it's structured... but it takes quite a long time to start up.
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I for one would love, if iTunes had a simple Music mode I can toggle in the prefs. I don't need Apps, Ringtones, Video or TV in there. I just want to use iTunes for music. That's it.
I just need my old school list of files I browse.
And I personally have set all audio files to open with Quicktime just because of the proplem you described above. If I wanted that stuff in my iTunes library, I'd just drag it on the Dock icon, wouldn't I?