I had squash bugs over 5 years ago, when I grew one of the round summer squash (Eight Ball or Ronde de Nice) and planted the seedling very early. I caught the bugs (pail of soapy water), destroyed the egg clusters, and learned to recognize the bugs at every stage of growth. They overran the poor squash plant and I spent a lot of time dealing with them that year. I have not had them since. The reason they've not returned is possibly luck, or because I planted later (after May 1 instead of March 15), or because I chose different varieties. I've heard that they have different preferences in different areas. I've grown Benning's Green Tint, Papaya Pear, and probably a few others at that same location, with no bug problems. It's a community garden plot, so if any of my neighbors had squash bugs, I would probably have had them, too -- and I've had neighbors who let their produce rot in the garden from Sept. to May, providing lots of opportunities for overwintering pests.
I also compost everything from my gardens, and have had no recurrence of squash bugs from the compost.