My "house rules" document for my B/X game is 24 pages long. The last 8 pages of it are just the various charts from the rule books cut and pasted for the players' easy reference. Another two pages are campaign background information. So, the actual house rules take up about 14 pages, much of which is more in the nature of clarification and explanation than actual changes to the rules. I've been strongly considering shortening it quite a bit.
For what it's worth, I would gladly play an rpg in which each character was mechanically identical. The character building aspect of rpgs holds no interest for me. (Don't get me wrong, I love a good random mutation/super-power chart as much as the next guy.) Laundry lists of spells, feats, skills, etc. just make my eyes glaze over. Char-gen more complex than core rules 1e is more than I can really stomach, with 1e being a shade on the too-complex side for me.
I realize this puts me in the vast, vast, vast, vast, vast, vast minority of rpgers out there.