I agree with the general consensus - it was sad to see the Queen on the balcony. Could possibly be the last time we see her up there. Her signature looked more wobbly than usual on the statement she's just released too.
The monarchy doesn't mean much to me, but the Queen is iconic really. In the UK, her image has surrounded every single living person's life on a daily basis, on stamps, on coins and banknotes, on TV, and her name adorns all manner of public buildings. I imagine she is also one of the things that people from other countries would most associate with the UK, such is her longevity.
It was good to see such a huge turnout on The Mall. I will be sad when she goes.