How to Install minimalistic, Wingpanel-like XFCE setup
1. To get the panel to show up above maximized windows, copy/paste the following command in a terminal (thanks to Nick Schermer for the tip!):
xfconf-query -c xfce4-panel -p /panels/panel-0/disable-struts -t bool -n -s true
2. Right click the panel and select “Panel Preferences”:
On the Display tab, uncheck “Lock panel” and change the panel length to something smaller then 70-80% (whatever you like).
3. Go to Settings > Settings Manager, select “Window Manager” under “Title alignment”, select “Right” and only place the title, minimize, maximize and close buttons on the titlebar:
You can of course place them all on the left if you want, but make sure to also move the panel on the right.