I am not sure how much time I am going to take off after my surgery, it all depends on when I get to have it done. However, I do intend on using STD. My work is a little different from others though, I think. Mine pays the first 6 weeks 100%, after that it's like 60% or something. I am hoping to only take a week off but I have heard people taking 2.
It is a medical procedure so you really should be able to use STD, not vacation time.
Hope that helps.