I vaccinate for everything. I'm a dog walker and Bu goes to work with me. Even when he doesn't go with me, I don't know what I'm going to come home with. I also take him walking on trails in the woods and swimming in streams, ponds and lakes. He also goes to the dog park and sometimes to doggy day care. For us, with our lifestyle, I wouldn't risk not getting the vaccines. In fact, before my vet does certain vaccines, he asks us about different things we do and if we do high risk things, then he'll vaccinate, otherwise he says not to give certain vaccines.
On the other hand, if we didn't have the lifestyle we have now, he wouldn't get nearly as many vaccines as he does. You need to weigh your lifestyle and his exposure to things against the risks. It is going to be different for every dog and every family.