Back while I had tons of accounts all about the 'net, I've heard tons of references and even saw some screenshot motivators of the game one place or another (both ASCII and Mayday sets; it was the Mayday tileset that caught my attention more to the game in a motivator); and I recall hanging around the Something Awful boards (back while it meant something, I think; the LP section was most worth my time there), I remeber seeing Boatmurdered in motion (It's revival process at least, never looked inside, and nowadays I kinda regret it), and several other DF games going on.
Taking interest, I decided to try the game out (while it was still 2D and fun to learn). After enough not knowing exactly what the heck I was doing, I gave up. Trying again a half-year later, it was 3D; did a few small forts of fun, gave up with frustration and much fun. Many megaprojects and thread lurking later (for another half-year before I committed myself to the boards here more often), my interest gets revived once more, I experiment a few design changes to my playing, and make a successful fort (not super-high, to the point of kings and economy, but good enough to pass for me); and then the ultimate test of my gameplay experience, take on a megaproject of my own.
I think the humor and depth of the game caught my attention most, I mean, the level of creativity for projects and fort designs. This was the kind of crap I did in my free time, or while I was bored in some of my classes with a pen and paper, just designing all sorts of forts and machines and such, this game allows me to actually build them (somewhat). I still gotta interpret some of my old sketches and convert them into DF-able forts. I have some nifty architecture in my sketchbooks.