The feel of the game is the same, there is just more stuff. If you got bored once, you'll probably get bored again, even more so if you only got Bard to 50 and were bored before getting cross-class skills.

It's your choice ofc, can't hurt much to re-sub for a month and see how it feels to you. Worth is subjective after all.
I can tell you all day about how "worth" it is to come back, however I've played the game since beta and have never gotten bored. Best to just see for yourself.