Why does MSVC use SSE2 instruction for such trivial thing?

Question

The code:

double Ret_Value=0;

on default settings VS2012 compiles to:

10112128  xorps       xmm0,xmm0  
1011212E  movsd       mmword ptr [Ret_Value],xmm0

If SSE2 is disabled in project settings this is compiled to:

101102AC  fldz  
101102AE  lea         eax,[Ret_Value]  
101102B1  push        eax  
101102B2  fstp        qword ptr [Ret_Value] 

Edit: I am not sure that push and lea are related to this initialization, maybe it is for stuff done after that, just disassembly shows them for this C++ line of code.

Is SSE2 significantly better? Except that it is 2 instructions shorter? What kind of optimization is done here?

How this was discovered: the app started to fail on an old processor which doesn't support SSE2.