Blind-spot alert is very handy, but mine doesn't beep at all. Just inobtrusive yellow lights on A-pillars. If you signal a turn and there is a vehicle beside you, it flashes.
If it beeped I would've gone mad too.
So overall, it seems some manufactures integrated the new tech well, some did it poorly.
If a car comes up on the left lane (while I am in right), I can see it in rearview, then sidemirror + rearview, then in peripheral vision, the whole time.
It is possible a very small and fast unicycle could find a place to hide, but a normal size car can't.
If it beeped I would've gone mad too.
So overall, it seems some manufactures integrated the new tech well, some did it poorly.