I need to use cruise control just to stay out of traffic court - I'm a lead foot if left to my own devices.
My strategy is to pass as quickly as possible to find the next "hole" in traffic to settle into. Sometimes that means my speed varies as I try to maintain my position in the hole and people who I passed end up passing me. I figure as long as I'm over in the right lane, it shouldn't really be a problem for people to play leapfrog a little bit. I feel much safer not jockeying around in the clusters.
This strategy works not even a little in moderate to heavy traffic, in which case I simply get in the left lane and go as fast as possible, which if I'm lucky is 5-10 over the speed limit.