I am exactly where you are right now. I had a complicated year this past year, and I used to really enjoy complex choreography, but for the past few months I have been seeking out SIMPLE workouts.
I purchased Jenny Ford's Step Hero DVD and it's a great, mindless cardio because she's really just drilling the same step movements over and over. Anything that requires real choreography is not on my radar right now. The trick is finding that combination of simple yet still challenging enough to be worth the time invested.
Tracy Anderson is another one that lets me "zone out" but still work hard. Even her beginner dance cardio workouts are easy enough to follow
I mentioned in another thread that I had done Lauren Brooks' Shut Up and Train for a couple of weeks for yet again the same reason. The moves are basic, very uncomplicated, but I feel worked out. I want to get back to my Kettlebell Kickboxing workouts, but I don't know if my brain is ready yet, lol!