It is said that the only people who get bored are boring people. I'm not sure if that's true, but there's at least a little some truth to what that saying implies.
"Never getting bored" would suggest that a person has too many interesting thoughts to be bored (but also knows enough to stay away from things that bore him, which is a sensible/wise thing to do, of course). I'm not sure forcing oneself to be bored would lead to the kind of mood/thinking that would encourage creativity.
I don't know how creativity "works" for other people; but for me, the last thing that comes from my feeling rotten is creativity - and being bored is essentially feeling at least mildly rotten.
There's a difference between "getting-away-from-rat-race-thinking" (or even "adventurous-activity thinking") and being calm enough to encourage creativity. Then, too, being busy and active doesn't always mean a person doesn't have creativity "brewing" as he does what it is he's doing.
So, basically, I still go back to the thing that feeling bored is a negative thing to feel; and the person who (for one reason or another) doesn't feel bored very often may be more likely to be creative than the one who deals with boredom on a more regular basis. You know that thing they say, "A body in motion stays in motion"? I'd venture to assert that a mind in motion stays in motion too.