I'll probably keep a bike anyways for recreation, and getting around town. I'm a prolific sweater, so on the way to work I'd try to keep the intensity low for both walking and biking (this is why I can't work out in the mornings... even after a shower I'll have a good hour of increased body temperature and sweat through my work clothes). Otherwise, running would be a great idea (biking is much slower than you'd expect because of traffic lights that would be dangerous/illegal to run). Also, there's no shower at work.
If I change clothes at work, I can just keep all my work clothes in the office and have them cleaned at a place near work.
I agree this is probably something I'll just have to try both ways, and will probably mix and match. Ride bike into work. Lave bike at work because I'm going somewhere after work where I wouldn't want to park bike. Walk/bus home. Walk to work next morning. Bike home after work. Etc.
I do enjoy walking and find it meditative as you suggest. The bus takes 15 min also so that's probably only going to happen on rainy days.
P.S. I did consider an electric bike but I don't think the cost is justified vs. just going slow (it's relatively flat). I can take the bus for free due to transit benefits, so the point is mostly to get some kind of mild exercise in each day.