Great Question JP, I was running into this before I started learning about interesting skills.
In short the best way of thinking about crap jobs is the PERSON makes the JOB, not the job makes the person.
If you take your job seriously then you could be the trash collector, but you will add prestige and honor to the point people will feel better from knowing you.
I couldn't agree more! I take my job as a fishmonger with a lot of pride and I feel proud to be in such a profession, despite the smelling after work...
Just from learning small parts here, I've come a long way for me!