The only thing worth mentioning on this thread is that on the 737 it might be nice not to yank those speedbrakes. Deploy them slooowly. After years of flying the 737 both as a pilot and as a commuter in the back, I can say that wacking out the speedbrakes can be very startling because of the sudden jolt. Take them out slowly and no-one is bothered. Of course, every cadet on the 737 knows that after the first try.
Anyway, as most pilots will tell you, I have never ever heard nor seen any pilot do a PA about spoilers.