Hey Ninian, Thanks for reporting this. Could you please go to Preferences→User Interface→UI Scaling slider. It will scale the entire Illustrator UI proportionately. Let us know if increasing the value on that slider helps. Thanks.
An error occurred while saving the commentBen Ellenbroek commented
Unfortunately the UI Scaling slider is missing in my CS6 Illustrator (Dutch).
Scaling UI would really solve my problem with the thin cursor as well as the small menus.