Logging back in at lower levels is quite a rush at first. From the lightning-fast rocket ride of the first 10 levels to the new express train to Outland that is now available to all pre-60 characters. It's easy to ride the wave of enthusiasm inherent in playing a different toon.
My question to you is: has the thrill worn off yet? Does it feel like a grind (albeit a quicker one)? Is the different class you're playing live up to your expectations? Or are you so happy with your new class you may make them your main?