Great post, ABrass!
May I recommend the following?
1) Don't give anything away! Instead, stop buying anything for a specific period, say six months.
2) Devote yourself to listening to albums you haven't played in a while.
2a) Noj had it right when he said: I love coming across a disc I haven't played in a long time, popping it in and experiencing it again.
2b) Start storing your CDs and LPs by the LIFO method. With all your albums, you will have trouble finding a particular album. But you will be able to easily reach for an album you haven't heard in a while. That will enable you to hear things you haven't noticed before!
3) Ask yourself: Are my desert island disks the usual suspects? If so, try to appreciate your collection in a new light. Everybody is different, and with genuine appreciation your favorites will be your own, not the experts'!
4) Spend some time on albums whose songs have obvious melodies.
5) Start a computer spreadsheet of your collection, noting by year when you listen to an album. Only enter an album as you listen to it. I have found that the exercise has helped me appreciate the various styles of music in my collection, as well as albums I enjoy like an old shoe.
Peace and good luck!