There will be quite a storm when it happens, I would suggest mainly amongst Brexiters who voted for it. There's the cost and the bureaucracy to do it, but more significantly for Brits is the fact that the questions on the forms don't necessarily tie up with our needs - example, you have to give your first night's stay. So what of those on day trips? Also the first ones take 72 hours to process as I understand, that's if it runs smoothly. Rules out those "oh, let's hop on Eurostar" instant decisions which I'm sure those in the SE do frequently.
And thanks to Brexit, when we arrive we won't (as it stands now) be in the fast-track EU/EEA/CH lanes, nope, we will be "aliens" having to prove we have a right to be there. So the queues will be processed slower as everyone gets checked, and what are the chances there will be a problem with someone in front of you delaying you further?
But I hope that our dear Brexiters on their holidays won't stomach it and realise how much easier and better it was in the EU and change their minds. Maybe they might think haveing freedom of movement wasn't so bad after all?
Then, of course, we would introduce the same for EU's coming here. Many travel around with just an ID card. If they are subjected to filling in forms and obtaining visas (because despite the friendly name, that's what they are) at cost, they will simply not bother. Why should they when they can go shopping in the rest of Europe unhindered?
Those queues and hold-ups last summer are just a taste of things to come. It's the EU doing what we wanted it to do, keep out undesirables. Unfortunately that means holding us up too and the days of brushing aside foreign officials with our blue passports "we're British now stand aside" are, like the empire, long, long gone.
Only Britain could be stupid enough to vote to go beck to the dark ages. But the tougher it is, the more chance of The Will Of The People leading to a sharpish return.