Congrats on the new purchase. You will find yourself putting more miles on this bike than others you may have because it has an element of fun, and because it will keep you out of "trouble" if you get too tired etc. In many ways the electric motor is your safety net - just in case.
Thoughts:
-The Domane+ is a good price point, because its last year's technology. To upgrade costs several thousand more, for not much gain.
-The cycle computer is a bit primitive, but I just take my apple watch along, and it provides all the stats I need.
-I have 2 bottle cages and each can hold a 24 oz bottle no problems. The bike frame is plenty big enough.
-For the first couple of hundred miles I suggest keeping the display in the range mode, so that you learn how the motor and battery work during your specific rides.
-Most people ride at the same effort and cadence as they did on a conventional bike, so your physical work out will be the same. Be prepared to sweat just the same. You'll just go faster.
-I insist that every once in a while you find a proud, arrogant rider along your path, (you know that guy with $15,000 of apparel) and politely and definitively blow him away.