I believe that workers are more satisfied when they have many different types of tasks to do during the workday. 
    First of all,  according to the human energy management , different types of work will may let the worker excited and actively. You konw, there are 24 hours per day and it is fair for everyone, so if you do similar tasks all day long ,maybe you feel boring and unsatisfied because there are no opportunities to illustrate your power and ability, so you will be want to go sleeping and waste your work time. I think that is not a good choice. 
    Secondly, when you do the different types of tasks, you will try your best to search so many papers, journals and  newspaper to get more information, right?  In your daily life , when you do similar tasks it is very easy for you because you are so familiar with it, but when you facing another topic , you want to know what, how, why and the more and  more stories  behind  the problem. So I think it will  motivate your mind and you can have a great progress and more confident after a period of time. 
    Thirdly,  frankly speaking,  if you are a good worker you want have a nice boss who can understand you and take a high salary for you.  I would like to say that having  many different types of tasks maybe a good chance for you to have tight communication with your boss. Can you imagine that  if a  shame worker behind you without  any question?  If I am a boss , I like the worker who have many questions because he put his heart into the work and I can feel it. Although the result is so important  I will  give the worker more chance to improve it and  maybe high salary.  
    Well, I am a worker who are satisfied with different types of tasks.