I think there's a 'Queen and Country' aspect to it, and it's not simply about the monarch per se. A lot of the veterans and others made vows and have said prayers through the years to 'Queen and Country'. I think this is significant for a lot of people.
And I do also think a lot of people are acknowledging the end of an era. That doesn't necessarily bode well for Charles. It just means people are saying goodbye and thank you to Elizabeth II. She's not the last monarch but she could well be the last significant one and it all ends not with a bang but a whimper.
Hope you're home safely soon, @Hels20 That was impressive, given you had a leg wobble on there!