I think so. I care enormously much. I spent an inordinate amount of time finding a correct keyboard position and chair configuration. I ended up with a GoldTouch adjustable-angle keyboard I found lying around my workplace, plus two books taped together held up by a waterbottle stolen from a coworker to hold up my wrists. Then, I pilfered a sideways mouse that wasn't being used in another part of the office.

Nobody else at the company goes quite so far, but the two other main programmers do have Aeron chairs, at least.