I'd drop AK. It's not that AK is a bad park, far from it. I love the animals, the FOTLK and TTBAB shows, and the Dino ride are all favs of mine. But as much as I love it, I love the other three even more.
That said, I'd never schedule a vacation at WDW so short that I couldn't do all 4 parks and one non-park day, anyway. I'd rather have to take fewer long trips than take shorter trips more often.
Fly in late in evening, check into Disney resort. No parks, hang out at pool, explore resort, maybe a character dinner if money isn't tight. DTD also an option.
Then one day each at MK, Epcot, MGM, and AK with one day "off" in there someplace as a non-park day to hang out at the pool or do other non-park activites, again DTD is an option along with DQ. Do AK the last day, (we are always done no later than 2), since it takes the least time to tour, and head to the airport and fly home late.
This means you would spend 5 nights. At a Value resort with 4 day non-plus hoppers, and eating counter service or in room for most meals, that's a very cheap trip. If you really have the energy, you could also do a water park instead of the day off. Or make it a four night trip and skip the day off, although I wouldn't recomend doing it, spend the extra $$$ for one more night and take a day off, it's a vacation! I'd only make it shorter if I literally could not get that many days off from work. But if that was the case, I'd go to Vegas and not WDW, but that's me.