We visited IOA Dec 30/31 and Universal Jan 2. I opted ahead of time for the express pass on the 2nd only as price fluctuate depending on the day. It would have been a complete waste of money at IOA, express pass lines were similar wait times to normal lines. IOA was especially weird in that because it lacked a night show we saw Harry potter land go from being a capacity controlled 2.5 hour wait to get inside the land (inside... Let alone even trying to ride forbidden journey), to forbidden journey literally being a walk on by sunset on the 31st. So ya... I would actually recommend IOA for New years if you arrived around 6-7pm.
The Q bot would certainly help in keeping those lines capacity controlled, I would have been highly upset forking out an additional $60 for essentially nothing.
But the studios wound up being fairly busy the 2nd (Jaws of course... This trip was planned well before the closing was announced) and we found our express pass to be a great boon. Zipped past every line in under ten minutes.
Moral of the story, we had a great express pass experience, but I simultaneously saw an awful one at IOA. The capacity and timing control of the Q bot would fix that hopefully.