We are just back and did the cyber spacemountain thing a number of times. My husband is a big rollercoaster person and asked about making the maximum number of loops. There was a difference in the maximum number of loops between the worlds-- I think in "outer space" you could fit in 15 loops, but in "lava" and "ice" worlds (none of these are the correct names-- but its obvious once you're there) you can only get 13 loops. Ask the castmember who admits you to the ride-- they will be able to tell you for sure.
By the way, if you are interested: We bought annual passes to the waterparks and for only $30 more you got a DQ annual pass, so we went for this option as well and were glad we did. We really liked DQ but never really wanted to stay more than 4 or 5 hours, so the annual pass worked out well for us (frequently just spent an hour or 2 there). This may not be an option for you, but is worth considering if you can make the numbers work. The crowds seemed to vary quite a bit, and it was nice to be able to just leave if the waits were too long (for us 15-20 minutes is the longest we'll wait for anything).
Our favorite things were the Pirates of the Carribean, Buzz Lightyears Astroblasters and a videogame which was a simulation of the pod racing in the Star Wars movie. The rollercoaster thing was OK, as was the make-a-CD thing (but this was fraught with technical glitches which was very annoying after spending 10-15 minutes on your creation!). The rest we found only mild amusing, but I think these preferences are very personal and you'd probably find a wide range of responses to DQ amongst different people.
Beatnik