I'm a recent convert to dolly towing due to necessity. I bought a FWD car (Ford Fiesta ST) and found later that it isn't flat towable. All Fiestas except the ST are towable and the manual isn't correct. I've always towed Jeeps, so there was much wailing and gnashing of teeth when I first started using the dolly.
I prefer flat towing, but there is a lot to be said for a dolly. It makes more sense economically since it's a one time purchase and you can tow almost any FWD car. Setup for flat towing is pricey and goes with the vehicle. I've only used the dolly a few times and it's not difficult to load. I did it alone on the last trip. I store mine under the back of the motorhome, so it doesn't take up much space.
I plan to continue to tow with the dolly. Once you get a system down, it doesn't take much more time to load. If I change cars, I don't need anything to make it towable. But...I've been eyeing the new aluminum F-150 4x4 and if I buy one, the dolly is toast :)