My approach to arranging a library has changed in recent times. For each instrument, I have only three folders: Long, Short, and Add Tech (for Additional Techniques).
Then -- the tedious part -- I rename every instrument to include the company. So "05 TP_oV_Dynamic-Medium" becomes "Vienna 05 TP_oV_Dynamic-Medium."
This is idiosyncratic, but the long command lines had started to annoy me. I had hit a point where I would have search results like, E:\\Orchestra \\Trombones \\Ensemble\\ Long Notes\\ Vienna\\ 05 TP_oV_Dynamic-Medium.
Now it's E:\\ENS Trombones Long\\ Vienna 05 TP_oV_Dynamic-Medium." I am never more than one drive and one folder from my instrument. (ENS stands for "ensemble.") There are other benefits. Sometimes, when Giga's database doesn't refresh properly, I can browse directly from the slot without a multi-level folder navigation. The bulk moves and copies are easier, and the line reading in programs like Logic's Project Manager requires little if any horizontal scrolling.
Once an instrument is actually loaded, its source library is in the name to be read from the sampler. Sure, we recognize the naming conventions by now, but it's a little bonus.
And the best thing is, I don't lose any functionality, because all I have to do is type "Vienna Trombone Long" and Giga and EXS both list only the Vienna long trombones. (Searches in Windows or OSX do the same.) So I get the benefit of folder separation without the command line sprawl and serial clicking.
Ah, the McGill Samples. I thought orchestral replication could go no higher. If memory serves, they were from the Canadian university. I couldn't afford them. They were the VSL of their day.
And before that, the Six-Trak, with the proud brochure that read, "Your Personal Orchestra!"
I have to go. I'm started to get misty.