This thread was interesting to me! We're owners at the Marriott Ko Olina (right next to Aulani), and usually use our two bedroom villa for two weeks every other summer. Last trip, I said as we were leaving that it's so far (we come from Maryland) that I want to do the lock-off where we can split up the villa. Just this week I booked for next year mid June to mid July. First two weeks, just my DD and I will go over and have the studio. Then the boys will come over and we'll have the one bedroom (luckily they provide free rollaway beds, and the one bedroom has a separate sitting room that fits the rollaway - we've done this every trip).
While I'm excited to have four weeks on Oahu, my DD and I plan on making dinner most nights. We have gas grills to use, so can make stuff grilled and salads, sandwiches, and other easy stuff. It's just so much more relaxing than eating out every day. We know a lot of good local places to do carry-out as well. At Disney, I don't cook much (last trip I ordered so much from Garden Grocer that a lot was a waste, since at Disney we'd rather be out and about, BTW we were in a one bedroom at AKV Kidani). At the beach, though, we're so much more relaxed and some days won't leave the resort at all (there is so much in the way of activities at the MKO).
I know more than the two of us would get cramped, plus my DH works while we're there so would need a space to use his computer other than the balcony sometimes. But for just us two, we can share the king bed and have the sitting area still to relax and watch movies (MKO has free movie rentals which is nice).