Except there's this knot at the Eliot Bridge, which I thought was just GoogleMaps being weird and it would be intuitive when I got there, but no. I couldn't make sense of it, so I just looped back and went to the Somerville one -- which is an easy direct shot.
Coming home, I'd forgotten that the street does this weird split thing at Union Square. So I decided to just take Walnut. Except I couldn't remember where I was supposed to turn off of Walnut. I thought it was something obvious -- and looking at the map now, it's Highland, which one would think would be obvious to me, but nothing looked obvious and soon I was in unfamiliar territory and decided to just go with it. (Walnut gets STEEP, and although I consistently bicycle up College Ave., about halfway up Walnut I opted to walk my bicycle on the sidewalk.) So I ended up in Winter Hill, did not die on Broadway, and learned that Main Street is downhill ALL THE WAY to my house (which is kinda fun).
So that was about an hour of bicycling -- more than I'd expected but hey, I didn't have anywhere to be tonight (which is why I did my errand tonight) and I didn't get troublingly lost.