I didn't have a shower for #1. (I was supposed to, but I was planning to fly to it. I went into labor instead and got put on bed rest.)
We moved to our current neighborhood when DS was almost 2 1/2. When I got pregnant with #2, the neighbors said they wanted to have a shower for her/me. Since we were in a completely new area, with people who had not known us for DS's birth, it seemed okay to do that.
I needed very little, even with boy/girl, but I thought I should have a registry just in case. I did not register for "big boy" items for DS, but I did register for decor items for the kids' shared bathroom. That's what we needed, and it was for the new baby, too.
DS '04 "Boogaboo"
DD '08 "Lilybear"