I really like the island because it's quiet. There are no stalkers that start patrolling the neighborhood at 6:30 AM every morning. I don't see the same Sims jogging by throughout the day and late into the night. The worst ones are Eliza Pancakes, Nancy and Geoffrey Landgraab, Bjorn and Clara. In Willow Creek and Oasis Springs, teens come out late at night but can't be bothered to stop to talk to one of my playable teens. Newly generated townies aren't compelled to come to my neighborhood to grill platter after platter of food and then leave it all over the place to spoil. Vampires stroll around after the teens clear out in Willow Creek and Oasis Springs. The vampires are the only ones that I don't mind. They, at least, would stop to chat.
I like the lack of foot traffic on the island. Although recently I've noticed the mail carrier wandering around off and on during the week, even when no mail has been delivered,
The welcome wagon, for me, is always Clara and one other person from either her family or the Villareal family. I evict the Bro household because their lot is my favorite so they're gone when my Sims move in.
I've also noticed that the game doesn't generate as many townies when my Sims live on the island. If My Sims live anywhere in Willow Creek or Oasis Springs I see new townies walking around - elders and teens during the day, adults and young adults at night. I'm not sure why teens are walking around residential areas from about 10 AM until Noon when my teens are at school.
I've added a seafood restaurant and a small park to my island so that pulls visitors to the area when my Sims travel to either of those lots.