I've been doing this ( charging point spotting )for a little while now, ever since a couple of new builds had them fitted. The front of the houses have a smallish garden, then a parking area with block paviers and a central freestanding wooden post with the charging point fitted. I've seen a couple of vehicles parked at the kerb with a charging cable under a rubber anti trip strip.It's surprisingly hard to spot an EV tbh. The green plates have not long come in, and not every one chooses to have them.
You can't really keep track of all of the EV models now - there's so many.
Out on the road you're unlikely to hear much difference given how quiet engines can be and the fact that most of the noise is road noise anyway.
Best bet is to go for a walk round the neighbourhood and see how many charge points there are now.