Recently, I've found that watchers have become more problematic and dangerous than any help offered.
I've always time to chat, and explain if I can, don't mind that. But sometimes the volume of watchers is too much, they get in the way. Especially the little children I walk into. They're just the correct height to trip over or knee into.
Otherwise, when I know the locks, it's usually open those paddles fast and furious.
Keep moving.
When helping others: I try to remember to ask before opening paddles. It's their boat not mine.