Except that he won't seriously try to deport millions of people, just as he won't get Mexico to pay to build a wall and he won't start a religion test at border control. Whatever idiocy a Trump presidency might entail, it won't include many, or even most, of the things he has been saying.
There are parallels with brexit, I think. Many false promises and scare stories from both sides, a generally dismal level of debate, parts of the electorate keen to give the establishment a kicking by voting against whatever represents the status quo, and, if Trump wins, no doubt an escalation of violence from people who will fell empowered by his victory.
A Trump victory will lead to ugliness and no doubt deaths. A Trump defeat, I think, will change little - the problems that made Trump possible in the first place will still be there, the discontent will still be there, but the sense of empowerment won't.