The main reason I use Ubuntu over vanilla Debian for my desktop is lack of polish. It's not that I can't use it, but Ubuntu adds more polish, and what it takes away is stuff I don't notice because I don't tweak my desktop or laptop much anymore.
For the most part my "tweaks" consists of a git repo of my dot-files, and I rarely run more than a couple of full screen browser windows and a bunch of full screened terminal windows.
