I hate tipping - we tip very well, but I resent that employers can't pay their employees a decent wage and expect the customers to fill in the blanks and we are required to do it (although if we get bad service anywhere - which is so rare it's practically nonexistent - we don't tip. I think this happened once in 10 years). This rant, however, is for waiters and waitresses. Housekeeping is a different ballgame, since they do earn a fair wage and aren't undercut with the expectation that they make up the difference with tips.
That being said, we did tip during our stay in AK:KV. We never tip housekeepers at other hotels and usually don't at Disney. But on our first family trip, the mousekeepers went above and beyond every night - always a spotless room, towel animals, kids bedtime stuff arranged in a cute way (sometimes having a party on the couch, sometimes tied up in the curtains). My kids adored it and loved seeing what trouble their animals had gotten into while we were gone. We left $20 on that trip, with a note that thanked them for their excellent service and a job well done.