If you have a party of 4 or 5, then the answer is yes. They all have to be registered in the room, and you'll be charged extra if you have more than 2 adults, or more than 4 people total.
The Royal Pacific is the least expensive Universal Deluxe Resort and is within walking distance of the theme parks.
You get Express Pass for both your check-in and check-out days, which means you only need to book one night to get 2 days of Express Pass. We tried this once. (Normally, we stay at least 2 nights.)
If you are going to do this all the way, it means getting up early on the first day so you can get to the hotel at around 7 AM so you can park and pick up your room key, which also is your Express Pass. When we did this, we left our luggage in the car and headed straight to the parks. At night after the parks closed and we had dinner, we grabbed our stuff from the car and went straight to the room. (We received a text message with the room number.)
Then we got up early the next morning so we could drop off our bags in our car and head to the parks. At the end of the second evening, we walked back to our car and left.
Except for sleeping, we spent a total of about 90 minutes in the room.
Yes. The hotel gets you Express Pass. This is different than your theme park ticket.