I used to wheel my toddler in a stroller down it twice a day, as he was in daycare near MGH and I lived up in Somerville. I can still tell you where all the holes in the sidewalk where I would have to lift the stroller are (because they haven't fixed any of them in the intervening years).
By far the worst part of the walk is the Superior Nut Company loading dock. I had to roll the stroller out two lanes into traffic to get around trucks parked there, and they almost ran me and the kid over more than once.
E: I'm fairly certain I was one of the only people commuting up the flight of stairs at Linwood and Somerville Ext near brickbottom. Lifting the stroller up that flight of steps wasn't easy, especially when I was making the first set of footprints in the snow that day.
E E: Does the sidwalk on the bridge still flood? It used to fill with inches of slushy water and I would cross it by clinging to the fence like those enemies in super mario world:
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