Was it worth it? Probably not!
There's not much to see, since the original Ford birthsite house burnt down years ago. I read that there was some sort of replica home there, but didn't realize that it was just a small model. It's a nice setting, but the gardens weren't spectacular. There were several large engraved stones at the site listing such things as the governors of Nebraska and the mayors of Omaha, but they really don't add much to the site since they have nothing to do with Ford.
All-in-all, not really worth going out of your way to visit.