Pretty damn good; great energy and noise, crowds as big or bigger than the Yankees parades in the late 90s. Some "Boston sucks" signs in the parade got good response. Plenty of cute high school and college girls, many from across the river in Jersey.
Best t-shirts seen in the crowd: "18-1" lolStrahan's speech at City Hall at the conclusion of the parade was great, especially the part about stomping New England.
That NY wasn't supposed to even be in the game then demolished NE made this day even sweeter, everyone knew it. 
Videos: