Earlier quoted context omitted.
Inkscape on the other has started to show gradual decline in the UI department. For example every time you open a tool (the small dialogs on the right) all others will collapse. Since you normally jump back and forth between these tools during drawing you have to ask yourself what went on in their heads when they decided to make this change.
Have you tried using keyboard shortcuts to access the panels? I often switch between Layers , Align and Distribute , and Transform , but always use the keyboard shortcuts. Inkscape's UI is a point deserving of attention (the GIMP has a more elegant UI), but I can't say that I've found it to be in decline (on the contrary).
1. Press Ctrl+Shift+A on keyboard
2. Select alignment mode with the mouse
3. Press Ctrl+Shift+F on keyboard
4. Change color with the mouse
5. Press Ctrl+Shift+L on keyboard
6. Change current layer with the mouse
to 1. Select alignment mode
2. Change color
3. Change current layer
The latter is fluid while the former feels artificially slowed down.