I use my laptop at very different distances. Sometimes I use my trackpad, some times a mouse and sometimes my wacom, and the distances are different. It would be great to adjust the UI font size for when I push back the laptop and work on the wacom... thanks.
I also have a non-retina, but hi-res MacBookPro, which has more pixels than the default model, but not quite retina DPI )they introduced that the following model, DANGIT!)