The After Effects user interface is very diffuclt to work with at 4k, even on very large monitors. To wit, on a 32" monitor at 3840x2160, the text of a layer name is 1/16 of an inch tall– 8 layers are packed into each vertical inch. The Console Debug "AdobeCleanFontSize" workaround has no effect on some aspects of the interface, such as layer names, text in effect control panes, etc. This undersized UI poses legibility challenges, and slows workflow by requiring an extrordinary level of pointing accuracy to click on things.
Illustrator solves this problem elegantly by adding a "UI scaling" slider control to the "User Interface" pref pane. Photoshop solves this problem a bit less elegantly but still effectively with a "UI Font Size" and a "Scale UI to Font" option. I suggest the AE team adopts one of these appoaches. I'd also suggets that this be a very high priority. It is necessary for most AE artists to work at 4k these days, making this an annoyance that I deal with every single day. I feel this is the most glaring feature oversight in AE currently.
Thank you for your consideration, AE dev team. And if you are a fellow AE user reading this and you have the same issue be sure to upvote, because apparently upvoted posts in this forum is what passes as a feature request/bug report nowadays.
Thanks!