I do enjoy my job. I worked very hard to get where I am today. I take pride in my work but I also want to enjoy myself if I can. I understand what your saying and I agree, to a point. Yes you should enjoy your work, but some folks just don't have that option. Some people have to do what they have to do and if they can make that job a bit more fun along the way, then why not?
I've worked several jobs that I did not enjoy, but I had to do it to make ends meat, but I always found ways to have fun when I could, to make the job more enjoyable. The job I have now is the best job I've ever had. But I've worked for it. I don't want to do this job forever either, but for right now its just fine and I make the best out of it.
I hope that makes sense and doesn't come out the wrong way. Sometimes posting things online doesn't come across the way you want.
Basically if you can enjoy life, do it. If your job is working for you and you can find time in your day or night (in my case) to enjoy yourself, then I say, go for it.