We've had this feature available for a while now, and I've yet to see this be used for vacations.
All I'm seeing is people using it to save villages from being destroyed and getting a reprieve from being farmed.
These are active players making this choice strategically. I am yet to hear of any player in the game use this tool for a vacation.
In fact, the only players I've known that have gone on a vacation or small period of leave since this tool was introduced have found it better to use the already existing tools (sitter/dual) as it is better for their account.
My preference would be for this feature to be removed completely, but I can see there being a need for something to assist players with being able to do something if they leave for a short while.
Some alternative suggestions would be to completely stop you from doing all actions (not rebuild your walls etc.) or give only protection to the troops, not your resources.
Honestly I don't have great alternative ideas, but something needs to change because this is not being used for the intentions it was implemented for.