I tend not to be as cranky... and I sleep better. I'm on "vacation" right now, so I'm not doing daily rides, but the rides I've been doing have been longer. When school starts I'm actually looking forward to dropping back down to 32 miles a day.
One thing I've noticed is that I've gotten a bit more "smug" about saving gas than I was before I started commuting. I smile a bit too much when someone brings up the price of gas.