same here re learning new things about blender most days, even the 2.4x versions still had features etc that i barely touched if at all, but back on topic. i can understand the optimization, what i don't understand or agree with, is taking the choice away from the user.
this new interface is imo holding some of us back from using a great set of tools, and it's not the general design of it, that i like, it's how buggy and awkward it is at times. at least we can remap keys which i've always wanted to see in blender.