Just wanted to report that the MKE Concourse C (US Air/United/etc.) line was about 40 deep today (Monday morning) when I got there at 4:15am (yes 4:15am). Took about 12 minutes to get thru (I have to say that the signs for a priority line, if there was one at all, wasn't clear to me; I wasn't too much in a rush, so I didn't bother; is it the far right lane?). So, not a total breeze, but not terrible either.
Also, not that this is new, but my Executive Elite selection at MKE when I picked up a few days ago was the usual at MKE (your choice of any car, as long as it is an Impala [mostly] or a Malibu [a few]).
Finally, a note of warning to fellow renters out there...I managed to get a nice $250+ speeding ticket within a mile or two after getting out of the airport exit onto I-94....that section of the highway is 50 or 55mph, rather than the rest of it, which is 65....BEWARE!