ach, if if was just that easy..
I am talking about the menu fonts, like in the menu bar on top of the screen, or the floating Inspector or Font windows in Pages. Those sizes can only be changed by changing the screen resolution. For instance, for word processing in Pages I would like to have the menu and floating window fonts about the size you get at 1200 x 900. Quite large, but comfortable to read. But changing the screen resolution mucks up the clarity of for instance of Lightroom, or photographs.
I had hoped that, with Retina displays available on MacBooks now, Apple would have addressed this issue for non-Retina displays as well, but alas!
With Lion, I had an icon on the top right of the screen to easily switch between screen resolutions, but with Mountain Lion it's gone..
Thymen