Since you already have these features on your current car, you will definitely miss them when they're gone.
The Premium Package is not a stupid cosmetic-only option that just adds visual enhancements.
You'll use Comfort Access, the auto dim mirrors, and the universal garage door opener everyday. Personally, I could take it or leave it when it comes to leather. The ambiance lighting is cool-looking at night and functional by letting you see what you're about to step into in the dark when exiting the car. Satellite radio is another ho-hum option.
Overall, it's a pricey option whose functionality helps justify the cost.