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What is an IOC container that is really here for me?

So, I completely redesigned the construct to install the constructor, and now I have a bootstrapper class that looks something like this:

var container = new UnityContainer();
container.RegisterType<Type1, Impl1>();
container.RegisterType<Type2, Impl2>();
container.RegisterType<Type3, Impl3>();
container.RegisterType<Type4, Impl4>();

var type4Impl = container.Resolve((typeof)Type4) as Type4;
type4Impl.Run();

I looked at him for a second before realizing that Unity really did nothing special for me. Left in ctor sigs, the above can be written as:

Type1 type1Impl = Impl1();
Type2 type2Impl = Impl2();
Type3 type3Impl = Impl3(type1Impl, type2Impl);
Type4 type4Impl = Impl4(type1Impl, type3Impl);
type4Impl.Run();

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public interface IBar { IFoo FooImpl { get; set; } }
public interface IBaz { IBar BarImpl { get; set; } }
public interface IBat { IBaz BazImpl { get; set; } }

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var bat = new Bat{
        BazImpl = new BazImpl() {
                    BarImpl = new BarImpl() {
                        FooImpl = new FooImpl()
                        }
                    }
                };

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