I walked up to the F counter at IND a few months back, no line, 3 UA agents chatting away -- and they refused to check me in and print my BP and bagtag, insisting I use the machine. I kinda protested and they held firm. Not atypical in my experience there.

Of course I've had variations of this at other stations -- and I gather that there are other motivations for this than lazy-ness (i.e. that they get measured by management on the % of self-checkins during their shifts) -- but still, in a half dozen trips over the last few years I guess I haven't experienced the UA/IND warmth that others have.