What I prefer may not be what I take due to RSI etc. I sure as heck prefer Model M but am typing on a Hama scissor because it somehow manages to give me almost no pain no matter how much and how long I type on it, including all nighters. It's basically a springy scissor, kinda tactile, possible to type without bottoming out (or at least without using as much force as is typically associated with bottoming out). I've just bought a Cherry Cherry with black switches, will see how it works out (I'm getting a hunch a linear switch could match my typing style), soon finalising the deal on a Solidtek 6600 with Fukkas, still talking to TVS about the $29 blue Cherry switch keyboard. I'd be able to say more then.

I'm technically 27 but due to technological lag (Poland in the early nineties) I grew up with an XT and coded my way out of physics homework in QBasic (the loveliest of all programming languages), so I should probably count in the 30+ group. I once wrote a config.sys or autoexec.bat from command line without a monitor and this is not something your typical 20-something nerd has done.
My favourite when it comes to key feel is the C2 3178 terminal keyboard that I bought for $7 a month ago (and admittedly couldn't identify), which is buckling spring and uses springs that can be put in a Model M (but feel totally different there and not 10% as good). To me, it basically feels like sparks are shooting from my fingers and I'm in my typing heaven. I would just love to be able to connect it to a PC but I don't think using an LPT>USB converter with or without some wiring works will cut it. I'm really at a loss as to what to do with it.
On the other hand, I think someone in the family inhereted my XT/AT keyboard and/or my step-father's AT keyboard. I'm just sure these were two separate pieces but I'm not sure which one went with which computer. I'll push him to try and recall what he did with the other one. Unless I'm lucky with E-Bay and find a Model F in Europe.
Anyway, you'd probably have me in the Spring crowd unless the mech switches manage to convince me.