At rope drop and park close, it will be busy. There is no escaping that. The good part about the Skyliner is that (theoretically) it keeps moving, so it can absorb a lot of folks very efficiently, but there can still be long lines - they move, but they can get long.
A friendly reminder: if it is stormy (windy and/or lightning) they will shut down the Skyliner, and everyone takes the bus.
Also please remember that the Skyliner will only take y’all to Hollywood Studios or EPCOT; you will still need to bus to Magic Kingdom and Animal Kingdom. (And Disney Springs if you want to visit there as well)