I'd love to have enough solar to run the fridges/freezers for a couple hours a day (not at the same time, and that's a low priority, honestly I could live w/o the food but being able to make ice would be a luxury), charge flashlights/batteries, run the shopvac (could be very important where I live), a few fans, etc. Of course solar is not always available, so it would complement the generator (use solar when I can to save fuel -- no natural gas here). Last time I looked it's still bloody expensive, but I wholeheartedly agree with thackney, it's insurance.
I'm on the fence about external lighting, safety vs making myself a target -- given my neighborhood it would probably come down to how many of the neighbors were around.