Driving is very stressful, and inherently risky (most people a cramped up in their car). Also, 45 minutes of walk is near ideal to get endorphins (AFAIK).

I try to double fork my commute, either explore some new path or do some groceries so the 45minutes are not just walk/train.

Right now I do bike - train - bike (but, surprisingly, trains are unreliable this month .. they're the one making me late :)