Do Mac users have eye problems – Switcher’s Log – Part 2

It seems to me that all text and other Mac OS X user interface elements are a little bit bigger than their counterparts on the PC. Why is that? It seems like the same size screen fits less stuff when attached to a Mac OS X system than to a Win XP system. It's annoying - it makes you feel less productive. I am hunting for some tweak software to adjust this but I am starting to think it doesn't exist. Why?