Oh man, I know too well what you're talking about, and I really must stop myself from thinking about all this. Or as Leonard Cohen puts it: "If these thoughts interest you for even a moment, you're lost".
Actually, I don't file my records alphabetically, but rather roughly by genre, and there by preferences, or how the groups somehow go together (from the players, labels, producers or just how they sound) so I just can take all records from here to there when I DJ, and I know it will roughly fit. The single artists are sorted by date.
But Jesus, if I even start thinking about filing them alphabetically by artist, I wouldn't find any sleep no more...