Hussar said:Is 2e really a rules light game though? Between the PHB and the DMG, you have 500 ish pages of rules. That's not how I'd define a rules light game.
Are you thinking of the original or revised rules? The revised edition filled out the page count a lot!

Don't forget: a great deal of the text of AD&D Second Edition is explanatory fluff. Another significant part is optional rules (the entire chapter on proficiencies, by the way). If AD&D Second Edition were stripped down to the essentials, it would be significantly smaller.
Something I don't consider "fluff," but which I do consider to be useless or a hindrance, is all the ecology detail in the Monstrous Compendium. If we don't count the MC, which you didn't above, then AD&D Second Edition is significantly smaller than AD&D.