We've talked about this, and I'm in favor of the Disney part first.
Mainly, because we keep the throttle pretty well wide open when we go to Disney World. Probably not even as much as some of YOU, but for us we're going all out.
When we've combined a trip with Disney, I always want the relaxing part afterward.
From my perspective, I'd hate to spend several days in Hawaii, with the first couple of days recovering from minimal jet lag, to then have to fly all night to get to Orlando where you'd be positively wasted the first couple of days.
Go to Disney World first, keep all cylinders going full blast, wear yourself out, then take a long flight to Hawaii where you'd have a week or so to do nothing but relax and think how much fun your NEXT trip to Disney will be!