We were there last October for half-term. It was a little busier at weekends but really nothing to worry about. During the week it was pretty quiet. Universal was virtually deserted. We easily did that and Islands of Adventure in one day. In Disney we rarely had to queue more than 20 minutes for anything. I remember getting to AK shortly after opening and doing Everest 3 or 4 times in rapid succession. A combination of early arrival and fastpassing meant we covered an awful lot. Don't trust those wait times - go up and ask at the gate. We would walk straight onto some rides that were displaying 20 min waits. I would thoroughly recommend October/November. The weather was fabulous with only half a day of rain in two weeks. Just be aware that one of the water parks usually goes into rehab in that time-frame so it's worth finding out which one and making sure you catch it before closure if possible.
