when riding DD, make sure you have your walking shoes on because it really is like a good 5 minute walk to the actual loading zone of the ride. Amazing themeing, the best I have seen in any park or attraction, but I could not imagine having to wait throughg the entire queue!
Also, it's obviously way more fun when both sides are running simultaneously...so it's worth a bit of a wait if one side is down. (always the fire side!) Try and do it in the morning, as everyone usually runs to the hulk first.