This is hilarious. You call others fanboys and then compare the horrific inconvenience of disk images (which I don't understand either but it's what, double-click and then drag, right) to Windows install wizards, uninstall, etc. Get real.
OSX by default (at least for DMG's) opens a window with the extracted content and most include "setup" instructions ("drag FOO into the Applications folder"), so it's not hard to miss.
I was afraid of that first, but after I briefly explained that to my father 3 years ago, he has never had a problem again (except with Flash Player)