This new single-purpose app from Dave DeLong is excellent. Apple hasn’t sold a Mac with an optical drive in years, but many of their keyboards still feature an eject key — presumably for both legacy support and because they do still sell that external SuperDrive. My dad has one; I think he’s used it once in the last five years.
Anyway, Ejector runs in the background so, when you hit the eject key on your keyboard, you get a neat little window with all of your mounted drives, and you can pick which one to eject. There’s a free seven-day trial and it’s just ten bucks.
Like its creator, I hope this gets sherlocked.