Yes, every masking takes time.
Those experienced retouchers(especially volume retouchers) that say it takes me 5 minutes to path out a subject... yeah right.
It takes me 5 minutes to path out a silhouette of a bald model wearing jacket and jeans, or a nude model, or a scuba diver.
Pathing out a dress with ruffles in 5 minutes? Pathing out lace in 5 minutes? Never gonna happen.
In cases like this where there are lots of merging in tone between dress and backdrop, I'd use pen tool for the dress, but obviously you go to channel selections for things like hair.
Don't path something you won't need! Or in general, masking something never to use it is just a waste of time.