As a good friend of mine says, one is fun, three is work and ten is a dismal existence. I (and I think most) often experience lack of motivation on tasks that are repetitive or tedious. Taking the time to refine your process with templates is a great idea and I have found that the more proficient I become with a particular item, the less arduous making multiples is. Plus, you increase your dollar per hour when you are proficient.
This is common and you'll either learn when to say no, learn what you like and dislike or learn to increase your pricing!