This is a comparison between 24.4 and 24.6. Look how at how few effects I can see on the Effects panel in 24.6 now that the spacing has increased massively.
Additionally, there's so much wasted space in the bezels of the window on all sides. But especially the bottom area with the New Custom Bin and Delete Custom Bin buttons. I have used those buttons basically one time to set up some folders of custom effects and never again. This should not take up that much space for a feature that is so rarely used, and even if it was commonly used, is still extremely easy to click with the old thin bezels.
We see this again in the list of keyboard shortcuts all now having this huge spacing which makes it so much harder to find things quickly as you'll have to scroll lots.
I appreciate most of the other windows have similar spacing to how it's always been done, but please revert these back to compact spacing as it's always been. It's especially frustrating for people still using 1080p screens where space is limited.
And heck, give people the option for compact or comfortable spacing as Gmail does for eg, but don't take away precious space without option!