Our boy is exactly like your boy. No need to neuter except for the female we have at home. We opted for vasectomy.. best of both worlds.
My boy had his vasectomy when he was about a year old. He is now 5 years old and I have never had a problem with females in heat. But he is just too busy with Agility classes and Nosework classes/trials to pay attention to them. He also spends his days with us on our horse farm that is fenced in. I think it depends on your situation.I expect my first Golden in the July timeframe and I'm learning every single thing I can. I had no idea that vasectomy was an option! I wouldn't imagine that it stops the the drive to mate, so I'm guessing that the boys will still go to any length to mate with a nearby female in season?