The last time I used minis was back in high school, and that was just because two of the guys I played with back then really enjoyed painting 'em and had huge collections.
These days, no one I game with owns any. We don't even use a gaming mat or use graph paper divided into 5' squares...it's all done by description, with occasional "cheesy GM maps" scrawled on notebook paper or a whiteboard to clarify where everyone's character is or what a room's layout looks like.
Probably I wouldn't hate playing with minis, but I think the moving and square-counting parts would put me more in a boardgame mindset than a roleplaying game mindset. It's easier for me to picture a fight as a big, organic whole when we leave out the squares and the counters and just play, I think. I imagine that it could still be fun in its own way to push little figures around on a map instead; just different from what we've been doing, that's all.
But using minis would require us to have an actual gaming table, and sit around it, which would suck. With our current system, we get to sprawl around the living room, sitting on couches or on pillows, getting up and moving around when we feel like it; sitting in a chair at a table like a normal person would drive me completely nuts.
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i think i've sat in enough chairs at enough desks and tables already
ryan