Barbara, I agree that if you already wanted to have more than one child (or if the second was a surprise that you embraced) then it can be a real joy to watch the children grow together and discover the world together. But I guess I wouldn't have a second child primarily for the sake of the first one.
I am one of those tired older parents, but I relish all the extra time I have interacting with my only child. I wouldn't want to have to share him :-)
And, I will also add, that not all of the ways in which GT sibs interact and entertain each other are good or healthy. I know many situations where the sibling thing squelched rather than nourished the children's gifts. So, yes, having GT siblings can be great, but nothing in parenting comes with guarantees and if it doesn't work out, you really can't return them. LOL.
