You have a kindred spirit in me!
You've received good responses from other posters, but one thing seems neglected: The sides of your core. To that effect, I like doing side deadlifts, sometimes called "suitcase" deadlifts. You do these one-handed with a barbell. The unilateral nature of the lift, along with the need to balance a 7-foot barbell in one hand, introduces a degree of awkwardness that makes it a valuable core strengthener.
The beauty part? It doesn't feel like an "ab" exercise
even though you're hammering your sides effectively. Try it!