Mind Your Language

I know the English language cannot stay the same as when I was at school but some Americanisms really annoy me.  When the waitress brings you your food and says "Enjoy".  Enjoy what?  You have to enjoy something.  The meal, the restaurant, the music?  Another bone of contention is "There you go".said by the girl at the checkout.  This is an "ageist" complaint.  The older checkout ladies say "goodbye".  Huw Edwards, the TV announcer (sorry - newsreader) always signs off by saying "Have a good night".  I always feel like saying don't tell me what sort of night to have.  Why not just "Goodnight"?
I'm often amused by road signs.  The ones that begin with "Slow".  "Slow  deer".  I always thought they were fleet of foot.  Or "Slow children crossing" or even worse "Slow Elderly Persons" with a picture of two bent , doddery figures with walking sticks.  (No need to rub it in , we can't help being a bit slow) I remember a building site with a warning notice saying "Men at Work" and sprawled on the ground beside it was a group of men drinking mugs of tea.  As for computer jargon - words fail me.  I'm told I was on a digital detox while I was without my computer.  You learn something new every day.