As a partial solution you can add multiple conditional DisplayString elements to each container type's information in a .natvis file.
The limitation to this is that you can specify that elements only up to some fixed maximum be displayed in the DisplayString debugger output (however, all elements are still displayed in the expansion area that you get when clicking on the variable's + sign in the debugger display).
As an example, drop this into a file named %USERPROFILE%\My Documents\Visual Studio 2013\Visualizers\custom.stl.natvis:
<?xml version="1.0" encoding="utf-8"?>
<AutoVisualizer xmlns="http://schemas.microsoft.com/vstudio/debugger/natvis/2010">
<Type Name="std::vector<*>">
<DisplayString Condition="(_Mylast - _Myfirst) > 3">[{_Mylast - _Myfirst}] ({_Myfirst[0]}, {_Myfirst[1]}, {_Myfirst[2]}, ...)</DisplayString>
<DisplayString Condition="(_Mylast - _Myfirst) == 3">[{_Mylast - _Myfirst}] ({_Myfirst[0]}, {_Myfirst[1]}, {_Myfirst[2]})</DisplayString>
<DisplayString Condition="(_Mylast - _Myfirst) == 2">[{_Mylast - _Myfirst}] ({_Myfirst[0]}, {_Myfirst[1]})</DisplayString>
<DisplayString Condition="(_Mylast - _Myfirst) == 1">[{_Mylast - _Myfirst}] ({_Myfirst[0]})</DisplayString>
<DisplayString>{{ size={_Mylast - _Myfirst} }}</DisplayString>
<Expand>
<Item Name="[size]">_Mylast - _Myfirst</Item>
<Item Name="[capacity]">_Myend - _Myfirst</Item>
<ArrayItems>
<Size>_Mylast - _Myfirst</Size>
<ValuePointer>_Myfirst</ValuePointer>
</ArrayItems>
</Expand>
</Type>
</AutoVisualizer>
And in your next VS2013 C++ debug session vectors will show up to the first three elements in the debugger's DisplayString output in a format similar to the old autoexp.dat display.
You can make the obvious additional edits to the custom natvis to display more than 3 elements. Unfortunately, you'll need to do something similar for each container type you want displayed this way; probably a good job for an intern.
