Wow! You describe Idaho Falls like it's a desolate island? The city of IF it's self has surpassed 50,000 and so most of what you'll need is in IF. Mostly it's the hub for communities north (St. Anthony, Rigby, Rexburg, Salmon, Roberts, Ririe etc. etc.) and for the outlaying in all directions. There's a mall here, along with national box stores and local retailers, fun places to eat that you'll recognise and some you won't; Wingers, TGIFridays, Olive Garden, Texas Roadhouse amongst others and locally owned ones as well.
There's an airport with more than just crop dusting

Delta, Alaska Airlines and Allegiantaire fly out of here. I believe another was added, just not popping into my head right now.
For those that like to "go to the city" for more fun, it's only a 3.5 hour drive to Salt Lake City, UT about the same to Jackpot, NV of you like to hit the casinos.
Brutal winters? That's all up to each own's opinion I think. Yesterday we got seven inches of snow and yes the temps later dropped to subfreezing, that however ins't what gets under your skin, it's the accompanying winds!
Boise's temps is more like the banana belt, while they get snow it doesn't seem to stick around as much.
Hope I've helped you out regarding the Idaho Falls area
