Definitely understandable.
Although now that I think about it, I definitely prefer twitch shooters on PC, but considering that genre is basically dormant at the moment...
Funny how it's called that when you're far more likely to score a kill with a point-and-kill game like CoD. I agree w/ what you're saying, it's downright frustrating to play Quake/UT on consoles as you're forced to keep a bead on enemies for extended periods, shoot rockets on their feet where they'll be in 2 secs, etc etc. Lining up a shot and popping their head in CoD feels pretty, good but this just pissed me off when I tried playing UT3 on my 360. Halo isn't quite like this but it's much closer in feel than CoD, and for that reason I could never get into that series.
With the bot players and the Titan gimmick, maybe Titanfall will come a bit closer to the twitch shooter type play though -- longer lives usually means it's not always that the first to click wins. Hope that we do see a beta of some sort.
I've tried using my trackball for FPS's a couple times and have been destroyed every time since I couldn't aim for shit. Maybe it's a matter of getting used to it, as it did take a while to figure out regular PC controls on it as well....
Hopefully Steam Controller will be a decent bridging device.