Clearly you are not the only one. The flat UI seems to be the hot idea among UI designers and I am sure that they are all impressing themselves with their work. But, to me, as a user, it is just a gratuitous change that does not contribute to the UI's usability. And, to my kernel s/w engineer eyes, it, for the most part, doesn't look as good as what it is replacing.
I wonder how long I will be able to get by with OS X Mavericks.