After the last update the physical gap between each song on the playlist is bigger. This leads to a lot of scrolling, and when you have a few hundred songs in a playlist, it will be a problem.
Before I could see 51 songs on my screen, but now I only see 38.
This is how it looks on my screen:
It should be optional!
Edit April 2014: It's even worse after the new update. Now only 21 songs show up at the same time.
Updated on 2018-06-16
since that idea has been posted there have been 2-3 major facelifts of the Desktop app.
Therefore this idea will be closed and linked to a more current one that focuses also on wasted space in the current Desktop app:
P.S: You can also Zoom out now, to decrease the font size.