I'm a straight keyboard player for pretty much everything - Ferazel, Carmageddon (1 and 2...I find the keyboard to be very easy to control cars in racing games, although I would love to see a Mac steering wheel set come out as those are a lot of fun), Quake, pinball games, whatever. It's probably because I use it so much for typing, it just seems natural for me when I use it for games. The only game I don't use the keyboard for exclusively is Descent 3 (and I'm sure you know why :))
I'm sure if I tried playing Donkey Kong Country 1-3 with the keyboard I'd be having a much harder time then I would with the SNES controller. I'm sure if Ferazel were on a console, I'd have no problems using a gamepad, but for some reason, it just seems normal for me to use the keyboard. Ah well, enough of my ramblings.
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-- Jeff