Isn't language great? The preferences expressed here are so in keeping with personalities.
I know I may be splitting hairs here, but the one I hate seems to be a Toronto-ism. You're standing in line to pay for something, and the cashier sings out, "Can I help who's next". It's so clumsy. How about, "May I help the next person?"
About having your cake and eating it too. I think that's a good one. It's about the separate enjoyments of having vs consuming. Once you've consumed something, you can no longer enjoy having it.
"No shit Sherlock" has also run its course.