It's a little annoying if you're trying to find someone, but other than that I love having my villagers everywhere! c: It makes a balanced town so it's not packed with animals!
It's a nice new feature, but it's frustrating when you're trying to deliver an item to them and look EVERYWHERE for them. Only to find them in the last place you look, the empty paintings section of the museum. And then you have to wait for them to leave because they don't accept deliveries or things they requested while they're in a shop or museum.
I think it's cute that the animals visit the entire town, but I do agree this feature can be cumbersome at times. However, in my opinion, the pros outweigh the cons in this case.