With the Patch 2.3 leveling increase changes, many players stuck at the level cap have either created new characters or dusted off forgotten alts.
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?