I have pretty much the same scenario as you, a 90 mile round trip to work. initially I thought I wouldn't be able to charge at work. Then I found 110v outlets and a guy with a converted prius plugging in, so I asked and was allowed to plug in. Then, due to a couple of others who purchased volts and my companies desire to do the right thing, they installed eight, yes EIGHT, 240v chargers, free to the public.
Even when I didn't think I'd be able to charge at work the effective gas mileage was still a dramatic improvement over my 20mpg Pilot. Don't forget to include the dramatically reduced costs in maintenance - your oil changes will occur a lot less often, there are no fan belts to change, etc. For me it'll probably be at 50,000 miles before my first oil change. Also, I may never ever need to do brake job. With my Pilot I got 105,000 miles out of each brake job (1/2 of my commute is freeway, the other half I just got good at feathering the brakes. The Volt in (L) has great regenerative braking, so my actual use of mechanical brakes is usually from 10 mph to a full stop.
The city driving when the gas engine is running is still a LOT quieter than my Pilot or our Toyota Sienna. A LOT quieter! Listening to Audiobooks, classical music, or any other music that has a lot of dynamics sounds SOOOO much better in the volt.
I believe there's a study showing that the 5 year TCO between a volt and a cruze was about $1,500. For $300 more per year I'm driving a car that is dramatically more fun, a lot quieter, looks a lot better, thanks to the weight of the battery drives great in the rain/doesn't get pushed around when passing trucks driving in the opposite direction (2 lane roads), and I'm sending a lot less money to the oil companies/foreign oil war lords.
I call the Volt my protect the troops, protect the trees, mid-life crisis car that actually makes financial sense for ME.
Go for a couple of test drives. Enjoy the zero shifting, the instant torque, the "game like" qualities of trying to best your battery mileage, the much quieter ride, and you'll be hooked.
Yes, initially it seems like a lot of money for the car, but really run the numbers. Put in all of the other driving you do (kids events every week, grocery store runs, etc). Do you come home have dinner then go back out for errands? In that hour, with a 240v charger, you get another 12-14 miles of battery life. That adds up. FOR ME, all of that put together means I'm spending $450 month less on gas. Yes, for the next 5 years that same money goes towards the car payment, but after that that's how much I'll be saving. Considering I keep my cars 10+ years that will add up. Yes, the battery mileage will go down over time. But still, it's a (for me) 40 mpg car when burning gas.