Mixmaster:
Yes, I see your point with searching from the (e.g.) File Explorer of XP, and quickly beinfg able to drop an album on a player (I use Foobar2000) is an excellent point. Unfortunately XP File Explorer even today doesn't natively support FLAC tags, so it's a drag having a folder with mp3 and FLAC mixed and not being able to quickly sort according to album by using only one column (the Ogg directshow filters enable FLAC tags in File Explorer, but yiu have enable them columns separately).
Regarding genres, yeah 140 is way too much, many of them are currently now erroneous and unnecessary

. But the rationale behind having many is that besides listening an album at the time (I'm an LP kind of guy

), I enjoy getting a random mix of a genre. And if my feeling is that I want to listen to "serious" heavy (e.g. Iron Maiden), I don't want to get an interlude of Mötley Crüe "party# heavy.
Ethnic music is one that keeps getting new entries, since I label genre according to country or region. So under Ethnic I have subgenres like Africa, China, Japan, Nordic, Native American, Celtic, Scottish (yes, should probably merge with Celtic), Russian, India, Tibet, Middle East...
Additionally, I enjoy the small educational fringe benefit of learning a music style's own classification through appropriate genres. Classical music I've hence tagged according to Romantic, Modern, Post-Romantic, Contemporary etc. Reggae will have separare entries for Roots, Ska, Rock Steady, Dancehall and Ragga...
I'll do some more thinking about placing albums in their own folders though, we'll see how it feels after some time

.