It seemed pretty popular to me, I was in London coronation weekend and it was a really good atmosphere with streets packed with people.
I think there are 4 groups of people, those totally pro monarchy, those who sort of like it (I'd say I fall into that category), those who have few feelings either way, and those that are anti monarchy.
Personally I don't think I know anyone who is anti, I'd say most fall in the middle two categories.

