That said, I do use a few extensions, and I'm exploring writing ones as well. The fact that extensions are written in javascript is really nice (or awful, depending on how you feel about javascript). The built in debugger/console looking glass (type ALT+F2, then lg, the press enter) is very helpful, and window identification/selection is very simple. Being able to extend the environment in a relatively easy way with a scripting language is a big win in my book
ymmv, but I find it to be a nice environment. I'm not 100% satisfied, but I'm far more satisfied with it than, say, OSX or Windows, and slightly more satisfied with it than Unity or KDE.