Yeah. I run old hardware and when I switched from Xfce to Openbox because "it's lighter" I almost fell out of my chair when I realized my Openbox system was using twice the resources. Of course it was my fault and I changed it up (no more compositing!) but I gained a lot of respect for Xfce in that process.

Also when building a DE from scratch it's nice to know that any of the Xfce pieces will 'just work'.