The only bad experience we had with the ART was at closing, during the summer. It was a mob scene at the loading area and a very rude ART employee was threatening people with kicking them (us) out of line if they (we) didn't stay single file. Didn't go over so well with a few people that demanded her supervisor's name. The ART shuttle was so packed that we practically had strangers sitting on our laps. Whew, sorry for the rant.
Anyway, we plan on using the ART for our Jan and Feb trips. That being said, we would have stayed across the street from the main gate but the deal we got on our hotel was too good to pass up.