Magnitus: I just never got people's obsession with UIs. For me, I'm fine if I have something usable and functional, I just don't spend a lot of time and energy fussing over it.
Before Unity, I used Gnome and I was perfectly happy with that too. Frankly, having used both, I'd be at a loss for choice between Gnome and Unity. I just don't have a strong opinion about it.
Well, trying a new one takes ~30mins at most, so if it can save you 30secs a day through less typing and clicking, it's worth trying two or three a year. Specially when you consider you can delay that until an off day when you've got little else to do (other than, y'know, playing games :D), while the biggest savings occur when you're busiest.
Still, it's also true they're all pretty mature these days; I personally use Cinnamon, but only because a) it looks slick, and b) it's Linux Mint's default, which means I don't have to remember to "apt-get" anything post-install, it Just Works(tm). Well, other than changing keyboard layout and remapping Caps Lock to something useful, but between the two they probably save me at least 10 minutes a *day*, so it's very much worth it.
Magnitus: It's the same thing with text editors. Some programmers got apeshit on all the features they can integrate in their text editor. If it's strictly up to me, just give me a text editor with syntax highlighting, good indentation support and I'm happy.
Oh, in that regard I'm the same as you, with one tiny little exception: performance and resource usage. If my editor takes more than 1-2 secs to boot or consumes precious RAM I've set aside for Starde... *ehem* PostgreSQL, bye bye it is; hence why I don't use the newest shiniest ones like Atom or Brackets, nevermind full-blown IDEs like Eclipse. But before Sublime I used to use Vim, dabbled a bit on Geany as well, and they all pretty much Just Worked(tm).
Magnitus: EDIT: The main factor which might sway me is resource usage. XFCE is the only one of the bunch I'm somewhat curious about, because apparently it's supposed to be lightweight on resource usage with does appeal to me.
LXDE is also quite light, even lighter than Xfce I'd say, and the tiling managers could probably run on a toaster. Of the bunch, I'd decide based on taste and previous experience: if you prefer a Windows-like UI go with LXDE, if you prefer an OSX(or rather, CDE)-like interface go for Xfce, and if you enjoy making your computer unusable to anyone who hasn't spent a week reading through a tiling manager's documentation, go with one of those instead.