The only one I regret seeing disappear is "rub of the green" but it was generally misused anyway.
I still hear that one. Personally, i don't use it very often but i have used it. So it's not gone completely just yet.
Red Penalty Area is rather clunky...so was Lateral Water Hazard.
True. Although, I don't really recall anyone actually saying "Lateral Water Hazard" or even "Water Hazard". They were both generally just referred to as a "hazard" which is still a better and less clunky term than "penalty area".
So far I haven't heard anyone say "Red Penalty Area" either, just "Penalty Area".