"In general, I would suggest at least starting it up every other week and let it idle for a bit."
This is worse that just leaving the thing sit. Starting a vehicle, running it for a few minutes and shutting it off, can rot out the exhaust system in a few months. The reason is that the combustion process creates water vapor. This vapor will lay in the exhaust system and rust the pipe and muffler out. The reason it does not happen to most cars is that when they are driven, they reach operating temperatures and the moisture gets "baked" out of the system.
IMHO, I would feel most comfortable if I took the vehicle out for a 10-15 minute trip at least every two to four weeks, and drove it through a range of driving conditions, including at least a few minutes of highway speeds. Pay careful attention to everything as if you were test driving a used car. Crank the heat up for a few minutes, then the AC, roll the windows up and down etc..... There are thousands of moving parts, seals, and lubricated surfaces that will benefit from being exercised. Just be sure that the vehicle reaches operating temperature and stays there for a few minutes before it gets shut down.
On a related note, in the "you should of listened to your own advice column" , I parked the wife's CRV in the garage after Christmas, and didn't touch it for three months, since we were down south. Here in the Northeast, we have become big fans of a hideous soup know as "brine" that is used for ice and snow control on our roads. It is highly corrosive. When I started the car, it took two attempts to break it loose, since the pads had literally rusted fast to the rotors. The damage is so bad that the brakes are noticeably less effective, and I need to pull the rotors off and have them machined to remove the nasty oxidized build-up on them. Had I properly washed the thing before long term storage, and made sure that it was driven every few weeks, this would not of been an issue.