Is it good habit to always initialize objects with {}?

Initializing objects with new {} syntax like this:

int a { 123 };

has benefit - you would not declare a function instead of creating a variable by mistake. I even heard that it should be habit to always do that. But see what could happen:

// I want to create vector with 5 ones in it:
std::vector<int> vi{ 5, 1 }; // ups we have vector with 5 and 1.

Is this good habit then? Is there a way to avoid such problems?