Among myself and a few friends, we use the term "improved user experience" in a sarcastic tone, as most of the "improved user experience" we get with some application updates tends to have showstopper bugs or make needless changes that cause problems.
Well, my Lubuntu user experience has just been "improved".
The window scrollbars on my UI have been needlessly altered, mostly on GTK2 applications. Instead of being the standard pencil-thick bar with an arrow at each end, they are now a thin and narrow strip, and this scrolling widget pops up whenever my mouse gets near it.
I have no idea where this change has originated or how to revert back to the old style of scroll bars, but it needs to go. Aside from being an annoying change, I'm finding that in some affected applications (such as Eclipse and Inkscape) I have to be careful when clicking certain areas close to the horizontal scroll bar, or else the scrolling widget will intercept my click. This is very disruptive to my workflow.