I've done - more or less- rope drop at MK a number of times, including very recently.
Here's my take.
1. We don't arrive all that much ahead of rope drop, and it doesn't usually make much difference in the sense that your arrival time does not always = front of the crowd. It is how aggressive you are once the crowd starts moving that determines where you land in line, not how early you arrive. (Unless the park opens early)
On the other hand, it can be tricky to get the arrival timing just right. So we don't beat ourselves up if we don't arrive before RD. We just adjust and get in line for a ride that opens at 9am.
2. Avoid the in-park Starbucks at all the parks unless they want to wait in a long line.
3. Specific rides don't always open at rope drop. It can be frustrating to get in line for a popular attraction only to have that attraction be late opening. If it happens, then your entire effort is wasted unless you successfully bail for a different attraction.
4. The parks are not currently very crowded. That works in their favor. (could change a bit once Epic opens.) Currently, all the WDW/Universal parks are pretty empty. Each day's crowds peak around 11am-5pm, but outside of that, many rides had fairly short waits, especially when the weather was cold or rainy. Another factor right now though is how many WDW rides are closed for renovation or soon will be. Having a major ride down decreases park capacity, so the park can quickly go from short lines to longer lines.
I think:
MK: Astro, BTMRR, Dumbo playground, HoP, and ahead: Riverboat, TSI.
AK: TtbaB, Kali, Triceratop Spin
Epcot; TT, Gran Fiesta
HS: LMcQueen
Our general strategy is pretty simple: know which rides get long mid-day waits and avoid them during peak hours or use LLMP for them. During peak hours, hit all the low-wait attractions. We often do well if we just avoid 7D at rope drop. We often do well heading to Space Mtn, but Pan is also a good option.
In AK, we can cover multiple rides while many park goers are stuck in the FoP queue. In the morning, that is the only queue with a long line.
5. Posted waits are often incorrect at WDW. Hard to know when they are correct, but early and late posted waits are especially suspect. They tend to be more accurate roughly noon-5pm.