I use Sound Juicer to rip music. I use it quite a bit to rip music, seeing as how I'm a DJ at WCBN. Also, I'm often ripping pretty obscure stuff, which doesn't have metadata listed online. This means that I have to enter the data myself.
The problem I have is that Sound Juicer isn't very data-entry friendly. When entering the names of several tracks, I have to use the mouse to click between those tracks. I wish that I could use spreadsheet-like keys -- tab or enter to move between columns and rows. I am not a fan of using my mouse. One day, I'll get a headband that I can wear so that I can move the mouse around with my mind, but until then, I want applications to be keyboard-friendly.
It's true, I should be entering my tracks into MusicBrainz. I would do that if it were easier to do. See my next post about Sound Juicer.

Update

It turns out that there are some standard keyboard shortcuts that I just didn't know about. It's not exactly as intuitive as I was hoping, and it's a little bit more cumbersome than ideal, but it works. It turns out that you push enter, and you'll be able to edit one column. When you're done, push enter again and you'll be back in "navigation mode", where you can use the arrow keys to move around and push enter again to start editing another column.
In my opinion, arrow keys are almost as bad as the mouse, but not quite. It would be ideal if the straight-up spreadsheet-style key bindings worked. It would probably mean subclassing some or other widget. But the existence of these key bindings makes it so that this is no longer important enough for me to worry about, I think. I'll be posting again if I find that it still annoys me.