Switzerland are NOT in the EU, they are one of the healthiest, wealthiest, cleanest, countries in the world, not the EU the world, the GDP is nearly doubled that of the UK, why didn’t they join the EU?
They didn't run up huge debt during WW2, had a banking system that allowed corrupt money from around the world to be hidden, have no real defence spending and have grown up alongside the EEC/EU as that organisation matured, taking adv of the best bits and staying away from the parts they don't like.
It also has a tiny well educated population, with nothing like the post industrial social problems the UK has.
Switzerland also has many bilateral treaties with the EU in place, though it appears not is all so cosy, esp over stock market access.
The UK leaving the EU overnight, with nothing in its place, is not going to mean the UK becomes Switzerland, not now, not ever.
For someone who lived in switzerland, you don't seem to know much about its relationship with the EU.