I would also love this feature. If you can use the built in ones to open the Applications, Utilities, etc folders, then why can't you create a hot-key(s) to open folders of your choosing?
I have 2 large working drives with all my client data, and I use them often. I LOVE keyboard shortcuts, and I would love to be able to just hit a key and it opens that folder. Using the Dock at the bottom isnt bad, but hitting some keys would be much nicer.
The feature is built in, obviously, so any Terminal pros we would love some help!