Other than avoiding any warranty questions, do you find having the dealership perform the 1k service is worthwhile?
That totally depends on the quality of the service department and the person doing the service. Many places assign such work to the least capable individual, not the real certified techs. And many places do little more than an oil change, blowing off most of the rest of the checklist even though you're paying for a complete service. If you trust your dealership to do things correctly, and you don't want to do it yourself, go ahead. Or you can have the service performed at an independent shop if you have one you trust more than the dealership. There is no warranty implication, regardless of what some might tell you. You can have the maintenance performed anywhere, including your own garage, without impacting warranty coverage. Just document everything and keep receipts for any parts and lubricants in case someone were to question if the maintenance had been performed. The first thing I purchase when buying a new bike is the shop manual; I highly recommend doing that even if you don't plan on doing most of your own wrenching.
Jerry