If I'm talking about a common system location, I don't even mention the slashes, e.g. "user bin", "etsy init dot dee", "var log httpd" and so on. If someone started off telling me to go to, say, "forward slash user forward slash library" I would just start transcribing /user/library, assuming it was something nonstandard. For /usr/lib, I'd expect to just hear "go to user lib".
Then again, I never liked "scuzzy" for SCSI, it felt awkward in conversation even with other techies. It grew on me about the time the protocol was dying out.
Also..."gif" as in "gift" or "jif" as in the peanut butter? ;-)
GIF as in gift, and all the other root-level directories you named, I'm on the same page as you.
http://www.tldp.org/LDP/Linux-Filesystem-Hierarchy/html/usr....
In current Unices, /usr is where user-land programs and data (as opposed to 'system land' programs and data) are. The name hasn't changed, but it's meaning has narrowed and lengthened from "everything user related" to "user usable programs and data". As such, some people may now refer to this directory as meaning 'User System Resources' and not 'user' as was originally intended.
The people who pronounce /usr as "you ess are" instead of "user" kind of drive me crazy though.