I reckon, if that no entry sign goes completely under, we'll get excited....
(I dropped down to to see how it had come up on my way home, and there were a lot of sight seers, and we were all having the same conversation along the lines of "It's high innit?" "Yeah, not as high as 2001 though" "Nah." "But it's still rising..." "yeah"....)
If anyone has ever read The Kraken Wakes, the passage describing the Thames coming up and overtopping the Embankment wall on two successive tides, is a perfect description of the mix of fear and excitement people feel.