This is so simple that I've been wondering for a year if I've been missing out some obvious function: Since I prefer working with objects' names displayed (and not reference names), I tend to forget reference names from the sitestore in the blink of an eye.
I got used to clicking on the folder or site, then pressing F9, taking a glimpse at the reference name, trying to remember it for more than a second and hitting "cancel". (Alt+p would do as well but requires one more click.)
Couldn't a simple tool-tip or "hover box" display reference name and / or ID without clicking?