Dr. J., hooray, good for you.
I've found that playing with CDs can be fun and definitely beats not playing at all. It's good for learning new songs, keeping your fingers in shape, and learning and perfenctin new licks. But the creativity that comes out of your brain and heart happens so much better live.
As Joey said there's nothing like feeling where the song is going, following or leading it there, locking in with a drummer. I love playing with a drummer who can play many different styles. When we can pick up on each other's cues, let the feel change from one style to another to another, and let our playing styles emerge rather than playing someone else's notes, in my way of thinking, that's as much fun as playing bass can be.
Rich