I don't think it's a stretch to call it the UI language of 95, while 2000 just adds more functionality within the bounds of that framework. Add in the Win7 search bar in the start menu, and the OS not crashing, you haven't really done anything of note with the UI beyond staying within its framework. It'll still be a Win95 UI.

Meanwhile, WinXP started to fiddle with the foundation of that framework, sometimes maybe for the better, sometimes maybe for the worse. Vista did the same. 7 mostly didn't and instead mostly fixed what Vista broke, while 8 tried to throw the whole thing out.