I haven't been playing anything specifically
because of Erfworld, but then that's because I'm a bit of a wierd one to begin with. I play some classic games (some might say "old, moldy, dusty, and deservedly so" but not me) and would do whether or not Erfworld tweaked my memory. I'll admit though that I may have played some of the classics a bit more when Erfworld first came out; I just honestly didn't keep close enough track to be sure either way. So as to let others choose whether the old games were better (which is my general belief; I consider most new games an attempt to reduce depth and increase beauty because flashy games with no substance and useless annual updates make more money), I'll link up the Strategy section at one of my favourite sites.
Abandonia is a great site wherein a lot of old software, no longer supported nor policed, finds a home. Goodies such as the Ancient Art of War, Ascendancy, Star Control, Command & Conquer and much more. (And including, incidentally, the already-mentioned Master of Magic)
WARNINGS:
1. You may require a DOS emulator in order to run some of the games on their site. You may further need a Windows 3.1 emulator (or install) on a DOS emulator to run some of them.
2. You may spend unwholesome amounts of time playing some of these old games because, while their graphics are dated and their interfaces sometimes clunky, some of them have depth of gameplay which hasn't been touched since. (offhand, the Might and Magic RPG series springs to mind, especially MM3.)