A friend gave me a spider plant from her garden. I didn't think to check it for bugs. Within a week, my other plants had aphids all over them. Now I'm spending hours cleaning them up. Please, always isolate new plants for a while.
Quarantine sounds like a lot of extra work for a tiny chance of bugs. Most plants from a good store are fine right away. You could just check them over really well and skip the waiting around. It seems like making a simple hobby way more stressful than it needs to be.