We did rope drop at both water parks in May. BB opened about 5 minutes or so early and Typhoon Lagoon actually opened a few late. Both times I would say we were in line to get in with roughly 100 people or so but there are so many paths that you don't feel rushed/pushed.
It definitely felt more crowded (clustered) at Typhoon Lagoon at opening.
I've never seen the spinners at either park to dry clothing,..I feel you may be overthinking this a bit; it's really not that stressful

Just do what you would normally do at your local water park.