AW's typically take time to make major jumps. It is good that there aren't major jumps every year, if there were, people would be upset (I know I would be). I only upgrade when there are major changes.
My AW history:
AWS0, AWS4 (gold) -> AW S5 (always on display), AWU1 (because Ultra), AWU3 (hypertension, sleep apnea, larger display).
I went with the S4 for Gold and water resistance that the S0 didn't have. I would have stayed on the S4 if the S5 didn't have AOD. I ride a motorcycle and always had a hard time seeing the time as the screen wouldn't come on without me taking my hand off of the handlebar (I always thought this was dangerous).
AWU1 -> AWU2 was not enough of a jump for me, AWU1 -> AWU3 was, and AWU2 -> AWU3 would not have been.
I gave my U1 to my wife, to replace her S8.