For me, it was highschool. I had a great group of friends, almost everyday my cousins and friends would be visiting. Some days I had 4-6 people all visiting me. Mom and dad were happy and healthy. I didn't need money so I didn't care I was broke. I was in love with a beautiful person who I still think about.
Now, in my 20s, I stay in my one bedroom apartment that costs more than my paycheque and I haven't seen a human face in almost a week.
Healing. Can you imagine how happy the world would be? Parents with a sick child can take them to the park for the first time. Bed ridden people can see the world with their own eyes as opposed to a screen. Despair and grief would change to happiness and serenity. I'd be crazy busy but if it means that everyone everywhere is guaranteed to live a long, happy life, I'd gladly pay the price.