Travel nursing offers up tons of opportunities to experience different cities, different hospitals, and different ways of doing your job. Every assignment offers up its own unique challenges and experiences, whether you're dealing with internal politics or figuring out new guidelines for a procedure you've done a hundred times elsewhere. Not every assignment can be a dream gig, but that doesn't mean there's nothing to learn.
Socrates once said, "True knowledge exists in knowing that you know nothing." While you certainly know many things, the real point of this quote is that there's always more to know. Even if you're sure you know everything to know about placing a catheter, another nurse may have a trick to show you. You could learn a new way of scheduling, or a method of soothing a patient that you've never tried. Let's say you get an assignment where everyone does things the exact opposite way that you would. Even then, you can observe the internal workings and get a feel for what works and what doesn't.
No matter what, there's always a way to take the skills and knowledge you pick up and apply them to make yourself a better and more effective nurse. The most seasoned person on the job can still learn to look at something from a new angle from a brand new nurse if they're willing to stay open-minded. When it comes down to it, we should all always be thankful for the work and opportunities we're given. After all, nothing's guaranteed.