I do the same--heavy rotation plus "an oldie"--
But, when I just want to listen, what I do is go to a marker that I keep in my collection (like a book mark) and listen & move the marker... it helps me rediscover a lot of the one-offs and things I probably wouldn't listen to regularly.
My collection isn't as extensive (2500 CD, 600 vinyl), but it probablys gets completely heard every 3-4 years.
But, when I just want to listen, what I do is go to a marker that I keep in my collection (like a book mark) and listen & move the marker... it helps me rediscover a lot of the one-offs and things I probably wouldn't listen to regularly.
My collection isn't as extensive (2500 CD, 600 vinyl), but it probablys gets completely heard every 3-4 years.