It isn't necessarily that tropes are bad, it's more like once you've seen a trope you can recognize the pattern and once you recognize the pattern you can more or less determine what's going to happen.
Is the Hero's Journey a bad trope? Not at all, as you've said — some of my most beloved stories are structured around the Hero's Journey. I don't know if you've ever heard of Redwall, but all of the books in that 'world' by Brian Jacques are very close to my heart. It's also part of why I understand that once you've experienced at least one or two good Hero's Journey's — you've more or less experienced them all.
Is it wrong to be entertained by them anyway? No, I hope you don't think I'm saying that.