People will make things work, as I, coworkers and friends have done so many times as well when picking up Su&Bu or Sweet Jesus.I'm not sure how notorious it is actually. I've worked around the corner for the past few years and the blocks are always being sat on while people eat ice cream. I've gone there for lunches dozens of times myself.
I'll point out that the crowds that are there don't necessarily speak to the quality of the public realm but the way people experience them do. I've heard several complaints about those different sized granite blocks that are too high and too low to sit on and the water feature that is an encumbrance given the small standing and seating space available.
At any rate, I'd rather have this space than not but it could use some tweaks.