I think maybe in this case unfamiliarity breeds contempt. I was really confused when I first started working in X1. The smart tool was WAY smarter than me. The Control bar didn't have what I wanted in it. Multi dock was docking stuff in weird ways and the going was slow and pretty rough.
But I really dug in and after watching the free groove 3 videos and digging some more, learning the Screen Sets and digging some more I now find X1 to be WAY more functional than 8.5 ever was. But it took time and I can see where someon would expect there to be a pretty easy learning curve but it's not.
Worth it to learn the new interface? I think so but maybe it's not for you, but giving it a real chance it just may grow on you.