I came of age in IT around 2005/2006, and it took me a really long time to connect the "scuzzy" people were talking about with SCSI as written. I always kinda liked the pronunciation though, once I figured out what it was referring to.
GIF as in gift, and all the other root-level directories you named, I'm on the same page as you.
My high school graduation present in 1995 was a TI TravelMate 4000M laptop computer. It had no built in CD-ROM drive (I don't think any laptop did until the late 90s) but it had a full size SCSI port on the back. I promptly went to the local electronics superstore and asked for a "Ess See Ess Eye" external CD-ROM drive. The clerk looked at me like I was smoking something, then said "Oh, you mean a 'scuzzy' drive, sure we've got those!" I distinctly remember thinking at first the guy must not be proud of his product lineup. A few moments later the acronym and his pronunciation clicked and I felt really embarrassed.
GIF as in gift, and all the other root-level directories you named, I'm on the same page as you.