We only get away for one weekend a year. The same person usually looks after the collection, but he's not a keeper himself. We wind up power feeding for the week leading up to it, then all our sitter has to worry about is water.
I've tried to set up a herp sitting co-op within our local reptile society, but response has been pathetic. My original concept was to recruit some volunteers to herp sit and then as other keepers requested the service, they volunteer themselves to return the favor at a later date. It seems eveyone wants to take advantage, but no one wants to step up.