well to start i know you can right click on you chat box tab to change the font size.......

also, not sure about your in game minimap as I use the mod Mappy , its re sizable and a great map addon.

As for the macro box text.. hmmmm... somehow i managed to change the font style eons ago so it comes up more Block Type and easier to read, just dont remember what i did, sorry.... anyone?

EDIT: I have a Fonts Folder in my main WoW directory which has the blocky fonts in it, i think some addon from the past installed the folder, not sure.