Biking to work went great. It took some time and a fair bit of energy but I made it ok.
Biking from work went not so great. Despite chowing down at lunch to try to refill my legs, they really gave out on me about 5 miles in, and the ride home was a struggle, to the point where I almost couldn't stand when I got off the bike to take a rest.
So regular bicycle commuting isn't going to be a thing on my own power any time soon. I'm still pondering the e-bike question, but I don't expect to make a decision quickly.