Just got back.
If you get in line at rope drop, the wait will be 45 minutes. I was there last Wednesday...got into MK at 9am and made a bee-line to 7DMT. Got to the ride at 9:05. At 9:05 the posted wait was 75 minutes, but ended up being only 45 minutes.
During the day, the wait was 90-minutes, typically. A real 90-minutes.
It is not really that great of an attraction. It is a roller-coaster for people that don't like roller-coasters. It is very smooth with small drops and it is short. The theming is ok, not great.
If you don't have a FP, I wouldn't wait any more than 15 minutes for it. Which means that if you don't have a FP, don't ride it, because the wait will not be less than 15 minutes at any time in the near future.