I'm using the latest Arduino IDE, and have found it lacking in only one area: it is nearly illegible at 1920x1080 resolution. I know I am one of the few Übergeeks out there who connected his computer to his 42 inch LCD TV with an HDMI cable. I must admit, once I upgraded from Windows XP to Windows 7, most of my readability issues disappeared. However there are a few stubborn applications that refuse to let me alter the font size of their user interface. The Arduino IDE is one of these. I currently use the Magnifier application when I have to, but it gets annoying after a while.
I like that I can change the font size and name in the preferences, but this is not what I am referring to. I'm talking about the text on the tabs, the compiler response text at the bottom, etc.