I agree with this statement: "IMO- it isn't about whether you're bike commuting, but about getting some riding in if you want."

I know when I made the commitment to commute and did so daily, my fitness went up and I was really happy about the whole process. Being laid off work, and still looking for a job, commuting distance is an important factor to me. But if I find a job like you, that is too far for the daily commute, I would seriously consider driving to a good stopping point and ride the rest of the way. Then ride back to the car at the end of the day for the drive home. But you must consider that this could add another hour to the commute time if you take into consideration the shower/cleanup and changing before work. You could do this two or three days per week and keep up the weekend rides.
My next option would be to drive the whole distance with the bike and either ride during lunch, or do a ride after work. I actually don't like the lunch rides as I am too concerned about getting back in time and my thoughts are mostly on the afternoon work. Often a commute on the freeway gets better if you delay leaving by an hour or so. Thus if you did an hour ride after work, then drove home, you may miss some traffic, feel good about getting some time in on the bike, and have a clear mind for when you get home.
Just some thoughts, good luck.