Every day work just feels more snappy and compile times are down by a lot. Single thread is a lot faster and of course having 12 threads instead of 4 makes a huge difference (of course that effect might be less for you since you already have SMT).
Paired with a 1060 I even notice quite a difference in gaming. Even though I didn't necessarily have 100% usage on the CPU, I was 10-20FPS below benchmarks for my GPU. This didn't really make sense to me, but after I upgraded I indeed got those extra frames.
I haven't done any scientific on the performance improvement, but according to PassMark, I am getting roughly a 120% performance increase on parallelizable workloads, even when taking my OC into account.