I have no idea about the history and lead-up of other temples, but I have some insight into the Tooele Valley area (thread...)
Then the housing boom hit in the mid-90s. Farming was becoming less profitable in the area. My parents decided to sell our land to a developer and start relocating our ranch.
This should have been a relatively simple proposition.
TL;DR - It wasn't.
That is awesome. It's not just "oh, Utah gets another temple." This Means Something to people - even those of us who don't live there anymore.
Now, I don't know if any of those skeptics or bullies from way back when are still around and it seems hardly appropriate to gloat...