JB, I do about 35 miles one way each day. 25 of it is on the 405 and the other 10 on surface streets. I'm pretty much going against the flow for most of it, but as everwhere, when the cages start to get impatient, or play bumper cars, it's every man for him self.
I thought about doing a camera setup, but looked at my ride through moviegoer's eyes, and found it was pretty boring. Like you say, it's subject to varying conditions.
I do get a little buzzy from the freeway portion on the way home, but take a big deep berath when I hit the off ramp. Then it's just picking around slow moving cars with no turn signals (shouldn't they be installd manditorily by the manufacturers? Can you imagine if brake lights were manually activated?), and on down the road.
One end of my ride has surface streets with much narrower lanes, so "filtering" to the front at traffic is a little tougher, the other end is pretty much wide open. People here call me crazy for doing a drive that long, but I love it.
I also have the option to cruise PCH on the way home. Basically from Huntington Beach down toward Dana Point. Sliding by the cars all stacked up in Corona Del Mar is great fun.