When it is crowded these days, it seems to be more temporary visitors like tourists and summer school kids than locals. Even the students aren't around as much as they used to be, as some of the university departments that used to be based in the centre have moved a lot of their work to sites further out now.
I find it striking that I have met friends who live nearby down in London more often than I've met them in Cambridge lately. I've also done more of my bricks-and-mortar shopping in the big shopping centres down London way than in my local city centre. There's so much more to do and it's just generally so much more interesting and alive (and, frankly, clean) that contrary to krona, I find it very different to the feeling in central Cambridge these days.
'...I hardly go into the city centre any more...'
Nobody goes there anymore. It's too crowded.